diff --git a/doc/RELEASE-NOTES.md b/doc/RELEASE-NOTES.md
index a08f915df..ce3be31ca 100644
--- a/doc/RELEASE-NOTES.md
+++ b/doc/RELEASE-NOTES.md
@@ -24,6 +24,7 @@ in progress and may not always be a stable version.
         reason "Too much abuse from this ISP. You are required to log in with an account using SASL.";
        }
     ```
+   * In [Crule](https://www.unrealircd.org/docs/Crule) functions as `match_asn(64496)`
    * Also available in regular extbans/invex, but normally users don't
      know the IP or ASN of other users, unless you use no cloaking or
      change [set::whois-details::geo](https://www.unrealircd.org/docs/Set_block#set::whois-details::geo).
@@ -35,7 +36,7 @@ in progress and may not always be a stable version.
   and configures what JSON methods can be called.  
   There are two default json-rpc classes:
   * `full`: access to all JSON-RPC Methods
-  * `read-only`: access to things list *server_ban.list* but not to *server_ban.add*
+  * `read-only`: access to things like *server_ban.list* but not to *server_ban.add*
 * [set::spamfilter::except](https://www.unrealircd.org/docs/Set_block#set::spamfilter::except)
   is now a [Mask item](https://www.unrealircd.org/docs/Mask_item) instead of
   only a list of exempted targets. A warning is created to existing users
diff --git a/src/modules/crule.c b/src/modules/crule.c
index f1e49f613..7a39a8b7e 100644
--- a/src/modules/crule.c
+++ b/src/modules/crule.c
@@ -141,6 +141,7 @@ static int crule_match_mask(crule_context *, int, void **);
 static int crule_match_ip(crule_context *, int, void **);
 static int crule_match_account(crule_context *, int, void **);
 static int crule_match_country(crule_context *, int, void **);
+static int crule_match_asn(crule_context *, int, void **);
 static int crule_match_certfp(crule_context *, int, void **);
 static int crule_match_realname(crule_context *, int, void **);
 
@@ -200,6 +201,7 @@ struct crule_funclistent crule_funclist[] = {
 	{"match_ip", 1, crule_match_ip},
 	{"match_account", 1, crule_match_account},
 	{"match_country", 1, crule_match_country},
+	{"match_asn", 1, crule_match_asn},
 	{"match_certfp", 1, crule_match_certfp},
 	{"match_realname", 1, crule_match_realname},
 	{"", 0, NULL} /* this must be here to mark end of list */
@@ -518,6 +520,16 @@ static int crule_match_country(crule_context *context, int numargs, void *crulea
 	return 0;
 }
 
+static int crule_match_asn(crule_context *context, int numargs, void *crulearg[])
+{
+	const char *arg = (char *)crulearg[0];
+
+	if (context && context->client && user_matches_extended_server_ban(context->client, "asn", arg))
+		return 1;
+
+	return 0;
+}
+
 static int crule_match_certfp(crule_context *context, int numargs, void *crulearg[])
 {
 	const char *arg = (char *)crulearg[0];