Hello,

how to configure reverse zone for x.x.x.x/18 subnet ,all the example on the internet are for /24 or /16 subnets?!!

Thanks

Hi,

Have a look here for Classless IN-ADDR.ARPA delegation rfc.
Also see the examples here

Regards

I have tried these methods without success

zone "63-0.x.x.x.in-addr.arpa" {
type master;
file "/etc/bind/db.x";
};

zone "0/18.x.x.x.in-addr.arpa" {
type master;
file "/etc/bind/db.x";
};

You must speak with your ISP and make sure he delegates you the subnet x.x.x.x/18
Also confirm with him the zone name (0/18.x.x.x.in-addr.arpa or 63-0.x.x.x.in-addr.arpa)
And try to give some dig results

dig -x was not successful when I used the above zone name..!!

I can imagine that it was not successful, otherwise you wouldn't make this post. Just give the dig output masking the IP, so we can see the response you get

a.b.c.d ---> ns.domain.com
dig -x a.b.c.d

#################################################################
; <<>> DiG 9.7.1-P2 <<>> -x a.b.c.d
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 24635
;; flags: qr rd ra; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0

;; QUESTION SECTION:
;d.c.b.a.in-addr.arpa. IN PTR

;; AUTHORITY SECTION:
a.in-addr.arpa. 1800 IN SOA pri.authdns.ripe.net. dns.ripe.net. 1298536290 3600 7200 1209600 7200

;; Query time: 225 msec
;; SERVER: a.b.c.d#53(46.60.48.130)
;; WHEN: Thu Feb 24 16:38:25 2011
;; MSG SIZE rcvd: 103
#####################################################################################

I think the whole b.a.in-addr.arpa is not delegated to some name server, as the SOA is ripe
Are you sure you have the delegation for the 0/18.x.x.in-addr.arpa subnet?x I mean the owner of x.x.in-addr.arpa should point to your dns for 0/18.x.x.in-addr.arpa subnet

Regards