{"id":178,"date":"2026-05-30T23:02:33","date_gmt":"2026-05-31T06:02:33","guid":{"rendered":"https:\/\/hostandtech.com\/kb\/whm\/whm-ip-exhaustion-fix-ip-allocation-error\/"},"modified":"2026-05-30T23:02:33","modified_gmt":"2026-05-31T06:02:33","slug":"whm-ip-exhaustion-fix-ip-allocation-error","status":"publish","type":"post","link":"https:\/\/hostandtech.com\/kb\/whm\/whm-ip-exhaustion-fix-ip-allocation-error\/","title":{"rendered":"WHM IP Exhaustion: How to Fix IP Allocation Errors on Your Server"},"content":{"rendered":"<h2>Overview<\/h2>\n<p>When WHM runs out of available IP addresses, it throws an IP allocation error that blocks you from creating new cPanel accounts or assigning dedicated IPs to existing ones. The error typically reads something like <strong>&#8220;There are no more IPs available on this server&#8221;<\/strong> or <strong>&#8220;IP address pool is exhausted.&#8221;<\/strong> This is a WHM IP exhausted condition, and it&#8217;s more common than you&#8217;d expect \u2014 especially on reseller setups and VPS plans where the IP pool is small by default.<\/p>\n<p>The cause is almost always one of three things: you&#8217;ve genuinely used every assigned IP, WHM is tracking IPs that no longer exist on the server&#8217;s network interface, or IPs were added to the network but never registered inside WHM. All three are fixable without a reboot or any downtime for existing accounts.<\/p>\n<p>This guide covers diagnosis first, then the actual fix. Skip ahead to the step-by-step section if you already know what&#8217;s causing it.<\/p>\n<h2>Prerequisites<\/h2>\n<ul>\n<li>Root access to WHM (or a reseller account with IP management privileges)<\/li>\n<li>SSH access to the server (required for some steps)<\/li>\n<li>cPanel\/WHM version 108 or later \u2014 older versions have a slightly different IP Manager UI, but the underlying process is the same<\/li>\n<li>If you need additional IPs, have your new IP address or IP block ready before starting \u2014 you&#8217;ll need the IP, subnet mask, and your server&#8217;s main network interface name (e.g. <code class=\"\" data-line=\"\">eth0<\/code>, <code class=\"\" data-line=\"\">ens3<\/code>)<\/li>\n<li>For VPS users: confirm your hosting provider has assigned the additional IPs to your node before trying to add them in WHM<\/li>\n<\/ul>\n<h2>Step-by-Step Instructions<\/h2>\n<h3>Step 1: Check Current IP Usage in WHM<\/h3>\n<p>Before making any changes, find out exactly which IPs WHM knows about and how many are in use.<\/p>\n<ol>\n<li>Log in to WHM at <code class=\"\" data-line=\"\">https:\/\/yourserver.com:2087<\/code>.<\/li>\n<li>In the left sidebar, search for <strong>IP Functions<\/strong> and click <strong>Show or Delete Current IP Addresses<\/strong>.<\/li>\n<li>Review the list. Each entry shows the IP, whether it&#8217;s dedicated to an account, and the associated domain. IPs marked as <strong>free<\/strong> are available for assignment.<\/li>\n<\/ol>\n<p>If every IP is assigned or the list only shows your main shared IP with no free addresses, you&#8217;ve confirmed the pool is exhausted.<\/p>\n<h3>Step 2: Identify Orphaned or Ghost IPs<\/h3>\n<p>This is the non-obvious part most guides skip. WHM sometimes holds IPs as &#8220;in use&#8221; after an account is deleted or transferred, but the interface doesn&#8217;t always make this obvious. Run the following from SSH to compare what WHM thinks is assigned versus what&#8217;s actually configured on the network interface:<\/p>\n<div class=\"ht-code-snippet\"><button class=\"ht-code-snippet__copy\" type=\"button\" aria-label=\"Copy code\"><\/button><span class=\"ht-code-snippet__feedback\">Copied to clipboard<\/span><\/p>\n<pre class=\"ht-code-snippet__code\" id=\"code-block-1\"><code class=\"\" data-line=\"\"># List IPs WHM currently tracks\ncat \/etc\/ips\n\n# List IPs actually configured on the server&#039;s network interface\nip addr show<\/code><\/pre>\n<\/div>\n<p>If you see IPs in <code class=\"\" data-line=\"\">\/etc\/ips<\/code> that aren&#8217;t bound to any active interface, those are stale entries. If you see IPs active on the interface that aren&#8217;t in <code class=\"\" data-line=\"\">\/etc\/ips<\/code>, WHM doesn&#8217;t know they exist yet.<\/p>\n<h3>Step 3: Release IPs Tied to Deleted Accounts<\/h3>\n<p>Sometimes an IP stays &#8220;reserved&#8221; in WHM after the cPanel account it was assigned to has been terminated. WHM should release it automatically, but it doesn&#8217;t always.<\/p>\n<ol>\n<li>In WHM, go to <strong>IP Functions &gt; Show or Delete Current IP Addresses<\/strong>.<\/li>\n<li>Look for any IPs listed with a domain that no longer has an active account.<\/li>\n<li>Click <strong>Delete<\/strong> next to the IP to remove it from WHM&#8217;s pool, then re-add it using the steps in Step 5 below.<\/li>\n<\/ol>\n<p>\ud83d\udcdd Note: Deleting an IP from this screen only removes it from WHM&#8217;s tracking \u2014 it doesn&#8217;t remove it from the network interface. No service interruption occurs.<\/p>\n<h3>Step 4: Run the IP Fix Script<\/h3>\n<p>cPanel ships a script that resyncs WHM&#8217;s IP database against what&#8217;s actually configured on the server. Run this before anything else if you suspect a data inconsistency:<\/p>\n<div class=\"ht-code-snippet\"><button class=\"ht-code-snippet__copy\" type=\"button\" aria-label=\"Copy code\"><\/button><span class=\"ht-code-snippet__feedback\">Copied to clipboard<\/span><\/p>\n<pre class=\"ht-code-snippet__code\" id=\"code-block-2\"><code class=\"\" data-line=\"\">\/scripts\/rebuildhttpdconf\n\/scripts\/restartsrv_httpd<\/code><\/pre>\n<\/div>\n<p>Then run the IP address rebuilder specifically:<\/p>\n<div class=\"ht-code-snippet\"><button class=\"ht-code-snippet__copy\" type=\"button\" aria-label=\"Copy code\"><\/button><span class=\"ht-code-snippet__feedback\">Copied to clipboard<\/span><\/p>\n<pre class=\"ht-code-snippet__code\" id=\"code-block-3\"><code class=\"\" data-line=\"\">\/scripts\/ipusage<\/code><\/pre>\n<\/div>\n<p>This outputs a breakdown of IP usage. If it surfaces IPs that are listed as used but attached to non-existent accounts, that confirms the stale-record problem from Step 3.<\/p>\n<p>\u26a0 Warning: Don&#8217;t run <code class=\"\" data-line=\"\">\/scripts\/rebuildhttpdconf<\/code> during peak traffic hours on a busy shared server. It rewrites the Apache config and triggers a graceful restart, which can cause a brief spike in load.<\/p>\n<h3>Step 5: Add New IP Addresses to WHM<\/h3>\n<p>If your IP pool is genuinely exhausted and you need more, you&#8217;ll need to add the new IPs both at the OS level and inside WHM.<\/p>\n<p><strong>First, add the IP to the network interface:<\/strong><\/p>\n<div class=\"ht-code-snippet\"><button class=\"ht-code-snippet__copy\" type=\"button\" aria-label=\"Copy code\"><\/button><span class=\"ht-code-snippet__feedback\">Copied to clipboard<\/span><\/p>\n<pre class=\"ht-code-snippet__code\" id=\"code-block-4\"><code class=\"\" data-line=\"\"># Replace ens3 with your actual interface name, and use your real IP\/subnet\nip addr add 198.51.100.25\/24 dev ens3<\/code><\/pre>\n<\/div>\n<p>\ud83d\udcdd Note: This change won&#8217;t survive a reboot unless you also update your network config files. On AlmaLinux\/CloudLinux 8+, edit the appropriate config under <code class=\"\" data-line=\"\">\/etc\/sysconfig\/network-scripts\/<\/code> or use NetworkManager. On Ubuntu-based systems, edit <code class=\"\" data-line=\"\">\/etc\/netplan\/<\/code>.<\/p>\n<p><strong>Then register the IP in WHM:<\/strong><\/p>\n<ol>\n<li>In WHM, go to <strong>IP Functions &gt; Add a New IP Address<\/strong>.<\/li>\n<li>Enter the new IP address in the <strong>New IP or IP range<\/strong> field.<\/li>\n<li>Enter the subnet mask (e.g. <code class=\"\" data-line=\"\">255.255.255.0<\/code> for a \/24).<\/li>\n<li>Click <strong>Submit<\/strong>.<\/li>\n<\/ol>\n<p>WHM will confirm the IP has been added. It should now appear as available in the IP pool.<\/p>\n<h3>Step 6: Verify the Fix<\/h3>\n<div class=\"ht-code-snippet\"><button class=\"ht-code-snippet__copy\" type=\"button\" aria-label=\"Copy code\"><\/button><span class=\"ht-code-snippet__feedback\">Copied to clipboard<\/span><\/p>\n<pre class=\"ht-code-snippet__code\" id=\"code-block-5\"><code class=\"\" data-line=\"\"># Confirm the IP is live on the interface\nping -c 3 198.51.100.25\n\n# Confirm WHM has registered it\ngrep &#039;198.51.100.25&#039; \/etc\/ips<\/code><\/pre>\n<\/div>\n<p>Then go back to <strong>Show or Delete Current IP Addresses<\/strong> in WHM and confirm the new IP appears with a status of <strong>free<\/strong>. Try creating a test cPanel account and assigning the IP \u2014 if it goes through without an error, you&#8217;re done.<\/p>\n<h2>Common Issues &amp; Troubleshooting<\/h2>\n<h3>&#8220;There are no more IPs available on this server&#8221; after adding a new IP<\/h3>\n<p>WHM added the IP successfully but it&#8217;s not showing as free. This usually means the IP was added to WHM&#8217;s database but immediately flagged as already in use somewhere. Run <code class=\"\" data-line=\"\">\/scripts\/ipusage<\/code> again and check for duplicate entries in <code class=\"\" data-line=\"\">\/etc\/ips<\/code>. Also check <code class=\"\" data-line=\"\">\/etc\/userdomains<\/code> \u2014 a stale domain-to-IP mapping can hold the IP hostage.<\/p>\n<h3>IP added to WHM but account creation still fails<\/h3>\n<p>If account creation fails with a network-related error even after the IP shows as free, the IP isn&#8217;t actually routable yet. Check with your hosting provider that the IP has been provisioned at the network level and isn&#8217;t just allocated on paper. On Host &amp; Tech VPS plans, additional IPs need to be enabled from the client portal before they&#8217;re routable at the hypervisor level \u2014 WHM doesn&#8217;t control that layer.<\/p>\n<h3>WHM shows IPs as free but they&#8217;re already in use on the network<\/h3>\n<p>This happens when a server migration or WHM restore didn&#8217;t cleanly transfer IP assignments. You end up with IP conflicts \u2014 two virtual hosts answering on the same IP, which causes unpredictable SSL and routing behaviour. Run <code class=\"\" data-line=\"\">ss -tlnp<\/code> to check what&#8217;s actually listening on each IP, then audit your Apache virtual host config under <code class=\"\" data-line=\"\">\/etc\/apache2\/conf.d\/userdata\/<\/code>.<\/p>\n<h3>Reseller can&#8217;t assign IPs even though IPs are available<\/h3>\n<p>Reseller accounts in WHM don&#8217;t automatically get access to the IP pool. The root admin has to explicitly allocate IPs to the reseller&#8217;s package. Go to <strong>Packages &gt; Edit a Package<\/strong>, select the reseller&#8217;s plan, and increase the <strong>Dedicated IPs<\/strong> allowance. This trips up a lot of resellers who are new to the platform \u2014 it&#8217;s not intuitive.<\/p>\n<h3>IP range added but only the first IP in the range shows up<\/h3>\n<p>When adding an IP range (e.g. <code class=\"\" data-line=\"\">198.51.100.20-198.51.100.30<\/code>), WHM parses ranges differently depending on your version. In WHM 110+, ranges are supported natively in the Add IP form. In older versions, you may need to add each IP individually or use the following script loop from SSH:<\/p>\n<div class=\"ht-code-snippet\"><button class=\"ht-code-snippet__copy\" type=\"button\" aria-label=\"Copy code\"><\/button><span class=\"ht-code-snippet__feedback\">Copied to clipboard<\/span><\/p>\n<pre class=\"ht-code-snippet__code\" id=\"code-block-6\"><code class=\"\" data-line=\"\">for i in {20..30}; do\n  \/scripts\/ipusage add 198.51.100.$i 255.255.255.0\ndone<\/code><\/pre>\n<\/div>\n<h2>Additional Notes for Resellers<\/h2>\n<p>If you&#8217;re running a <a href=\"https:\/\/www.hostandtech.com\/reseller-hosting\/\">Reseller Hosting<\/a> account, your IP allocation is controlled by the package your root admin assigned to you. You can&#8217;t add IPs directly at the network interface level \u2014 that requires root. If you&#8217;ve exhausted your allocated IPs, you&#8217;ll need to contact your hosting provider to either expand your IP pool or upgrade your plan. In my experience, resellers underestimate how quickly IPs get used up once clients start requesting SSL certificates and dedicated IPs for legacy mail setups.<\/p>\n<p>\ud83d\udcdd Note: With modern SNI (Server Name Indication) support baked into every current browser and mail client, most sites genuinely don&#8217;t need a dedicated IP for SSL anymore. If clients are requesting dedicated IPs specifically for HTTPS, they likely don&#8217;t need them. Shared IPs with SNI work fine for the vast majority of use cases.<\/p>\n<h2>FAQ<\/h2>\n<div class=\"ht-faq-section\">\n<h2>Frequently Asked Questions<\/h2>\n<div class=\"ht-faq-item\">\n<h3 class=\"ht-faq-question\">How many IP addresses does a WHM server need per cPanel account?<\/h3>\n<div class=\"ht-faq-answer\">\n<p>By default, every cPanel account shares the server&#8217;s main IP \u2014 so technically you only need one IP for unlimited accounts. Dedicated IPs are only required when a client specifically needs one, such as for certain legacy SSL configurations or private nameservers. Modern SNI means most sites work fine on a shared IP.<\/p>\n<\/div>\n<\/div>\n<div class=\"ht-faq-item\">\n<h3 class=\"ht-faq-question\">Can I add IP addresses to WHM without a server reboot?<\/h3>\n<div class=\"ht-faq-answer\">\n<p>Yes. You can add IPs to the network interface using the <code class=\"\" data-line=\"\">ip addr add<\/code> command and then register them in WHM without any reboot. The change is live immediately. Just make sure you also make it persistent in your network config files so it survives a restart.<\/p>\n<\/div>\n<\/div>\n<div class=\"ht-faq-item\">\n<h3 class=\"ht-faq-question\">Why does WHM show an IP as free but won&#039;t let me assign it?<\/h3>\n<div class=\"ht-faq-answer\">\n<p>This usually means the IP exists in WHM&#8217;s database but isn&#8217;t actually bound to the server&#8217;s network interface, or it&#8217;s flagged internally as reserved. Run <code class=\"\" data-line=\"\">\/scripts\/ipusage<\/code> from SSH to get a full picture of IP state, and check for duplicate entries in <code class=\"\" data-line=\"\">\/etc\/ips<\/code>.<\/p>\n<\/div>\n<\/div>\n<div class=\"ht-faq-item\">\n<h3 class=\"ht-faq-question\">How do I check which cPanel accounts are using which IPs in WHM?<\/h3>\n<div class=\"ht-faq-answer\">\n<p>Go to WHM &gt; IP Functions &gt; Show or Delete Current IP Addresses. Each IP is listed alongside the account or domain it&#8217;s assigned to. You can also check <code class=\"\" data-line=\"\">\/etc\/userdomains<\/code> from SSH for a raw mapping of domains to IPs across all accounts.<\/p>\n<\/div>\n<\/div>\n<div class=\"ht-faq-item\">\n<h3 class=\"ht-faq-question\">Will adding new IPs to WHM affect existing websites or cause downtime?<\/h3>\n<div class=\"ht-faq-answer\">\n<p>No. Adding new IPs to WHM doesn&#8217;t touch existing account configurations. Existing sites keep their current IP assignments unchanged. The only time downtime risk comes in is if you&#8217;re moving an existing account from one IP to another, which triggers an Apache config rebuild.<\/p>\n<\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>WHM IP exhaustion stops you from creating new accounts or assigning IPs to existing ones. This article walks you through exactly how to diagnose the problem and fix it \u2014 whether you&#8217;re on a VPS with a single IP block or a dedicated server with multiple ranges.<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[88],"tags":[72,375,374,69,4,89,377,376],"class_list":["post-178","post","type-post","status-publish","format-standard","hentry","category-whm","tag-cpanel-whm","tag-ip-address-management","tag-ip-allocation-error","tag-reseller-hosting","tag-vps-hosting","tag-whm","tag-whm-ip-exhausted","tag-whm-troubleshooting"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>WHM IP Exhaustion: How to Fix IP Allocation Errors on Your Server<\/title>\n<meta name=\"description\" content=\"Seeing a WHM IP exhausted error? 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