diff --git a/lib/internal/blocklist.js b/lib/internal/blocklist.js
index 28a31caa165e09..ba8a9ec45081b9 100644
--- a/lib/internal/blocklist.js
+++ b/lib/internal/blocklist.js
@@ -22,9 +22,10 @@ const { owner_symbol } = internalBinding('symbols');
 const {
   ERR_INVALID_ARG_TYPE,
   ERR_INVALID_ARG_VALUE,
-  ERR_OUT_OF_RANGE,
 } = require('internal/errors').codes;
 
+const { validateInt32 } = require('internal/validators');
+
 class BlockList {
   constructor(handle = new BlockListHandle()) {
     // The handle argument is an intentionally undocumented
@@ -81,8 +82,6 @@ class BlockList {
   addSubnet(network, prefix, family = 'ipv4') {
     if (typeof network !== 'string')
       throw new ERR_INVALID_ARG_TYPE('network', 'string', network);
-    if (typeof prefix !== 'number')
-      throw new ERR_INVALID_ARG_TYPE('prefix', 'number', prefix);
     if (typeof family !== 'string')
       throw new ERR_INVALID_ARG_TYPE('family', 'string', family);
     family = family.toLowerCase();
@@ -90,13 +89,11 @@ class BlockList {
     switch (family) {
       case 'ipv4':
         type = AF_INET;
-        if (prefix < 0 || prefix > 32)
-          throw new ERR_OUT_OF_RANGE(prefix, '>= 0 and <= 32', prefix);
+        validateInt32(prefix, 'prefix', 0, 32);
         break;
       case 'ipv6':
         type = AF_INET6;
-        if (prefix < 0 || prefix > 128)
-          throw new ERR_OUT_OF_RANGE(prefix, '>= 0 and <= 128', prefix);
+        validateInt32(prefix, 'prefix', 0, 128);
         break;
       default:
         throw new ERR_INVALID_ARG_VALUE('family', family);
diff --git a/test/parallel/test-blocklist.js b/test/parallel/test-blocklist.js
index 953b26eec46ade..0d537574c72e11 100644
--- a/test/parallel/test-blocklist.js
+++ b/test/parallel/test-blocklist.js
@@ -150,6 +150,7 @@ const util = require('util');
   const blockList = new BlockList();
   assert.throws(() => blockList.addSubnet(1), /ERR_INVALID_ARG_TYPE/);
   assert.throws(() => blockList.addSubnet('', ''), /ERR_INVALID_ARG_TYPE/);
+  assert.throws(() => blockList.addSubnet('', NaN), /ERR_OUT_OF_RANGE/);
   assert.throws(() => blockList.addSubnet('', 1, 1), /ERR_INVALID_ARG_TYPE/);
   assert.throws(() => blockList.addSubnet('', 1, ''), /ERR_INVALID_ARG_VALUE/);