Thanks for the reply.
Please see the DIG trace both for Forward DNS Zone & Reverse DNS Zone
==========================================================
Forward DNS Zone of domain ssf.gov.bd:
--------------------------------------------------------
dig NS +noadditional +noquestion +nocomments +nocmd +nostats +trace ssf.gov.bd. @8.8.8.8
. 375 IN NS a.root-servers.net.
. 375 IN NS b.root-servers.net.
. 375 IN NS c.root-servers.net.
. 375 IN NS d.root-servers.net.
. 375 IN NS e.root-servers.net.
. 375 IN NS f.root-servers.net.
. 375 IN NS g.root-servers.net.
. 375 IN NS h.root-servers.net.
. 375 IN NS i.root-servers.net.
. 375 IN NS j.root-servers.net.
. 375 IN NS k.root-servers.net.
. 375 IN NS l.root-servers.net.
. 375 IN NS m.root-servers.net.
;; Received 228 bytes from 8.8.8.8#53(8.8.8.8) in 37 ms
bd. 172800 IN NS dns.bd.
bd. 172800 IN NS surma.btcl.net.bd.
bd. 172800 IN NS bd-ns.anycast.pch.net.
bd. 172800 IN NS jamuna.btcl.net.bd.
;; Received 311 bytes from 192.112.36.4#53(192.112.36.4) in 21 ms
ssf.gov.bd. 86400 IN NS chan.ns.cloudflare.com.
ssf.gov.bd. 86400 IN NS james.ns.cloudflare.com.
;; Received 84 bytes from 204.61.216.108#53(204.61.216.108) in 26 ms
ssf.gov.bd. 86400 IN NS chan.ns.cloudflare.com.
ssf.gov.bd. 86400 IN NS james.ns.cloudflare.com.
;; Received 84 bytes from 108.162.193.178#53(108.162.193.178) in 1 ms
Reverse DNS Zone of domain ssf.gov.bd is:
----------------------------------------------------------
dig NS +noadditional +noquestion +nocomments +nocmd +nostats +trace 30.255.103.in-addr.arpa. @8.8.8.8
. 84305 IN NS a.root-servers.net.
. 84305 IN NS b.root-servers.net.
. 84305 IN NS c.root-servers.net.
. 84305 IN NS d.root-servers.net.
. 84305 IN NS e.root-servers.net.
. 84305 IN NS f.root-servers.net.
. 84305 IN NS g.root-servers.net.
. 84305 IN NS h.root-servers.net.
. 84305 IN NS i.root-servers.net.
. 84305 IN NS j.root-servers.net.
. 84305 IN NS k.root-servers.net.
. 84305 IN NS l.root-servers.net.
. 84305 IN NS m.root-servers.net.
;; Received 228 bytes from 8.8.8.8#53(8.8.8.8) in 38 ms
in-addr.arpa. 172800 IN NS c.in-addr-servers.arpa.
in-addr.arpa. 172800 IN NS a.in-addr-servers.arpa.
in-addr.arpa. 172800 IN NS b.in-addr-servers.arpa.
in-addr.arpa. 172800 IN NS f.in-addr-servers.arpa.
in-addr.arpa. 172800 IN NS e.in-addr-servers.arpa.
in-addr.arpa. 172800 IN NS d.in-addr-servers.arpa.
;; Received 433 bytes from 192.112.36.4#53(192.112.36.4) in 28 ms
103.in-addr.arpa. 86400 IN NS ns2.apnic.net.
103.in-addr.arpa. 86400 IN NS ns3.lacnic.net.
103.in-addr.arpa. 86400 IN NS apnic.authdns.ripe.net.
103.in-addr.arpa. 86400 IN NS rirns.arin.net.
;; Received 151 bytes from 193.0.9.1#53(193.0.9.1) in 125 ms
30.255.103.in-addr.arpa. 86400 IN NS ns2.ssf.gov.bd.
30.255.103.in-addr.arpa. 86400 IN NS ns1.ssf.gov.bd.
;; Received 87 bytes from 203.119.95.53#53(203.119.95.53) in 787 ms
;; connection timed out; no servers could be reached
==========================================
We have purchased our domain from BTCL registrar from Bangladesh & IP from APNIC with our own ASN.
Now, please guide, what should we do to have a proper reverse DNS zone with this IP block?
The dig trace output that you provided, e.g. namely this latter part:
indicate the exact same as I said above.
The 30.255.103.in-addr.arpa Reverse DNS (arpa) zone is from APNIC pointed to the two name servers:
ns1.ssf.gov.bd
ns2.ssf.gov.bd
From here, ns1.ssf.gov.bd points to one IPv4 address alone, but that specific IPv4 address does not respond to DNS queries for the 30.255.103.in-addr.arpa zone.
A DNS query for ns2.ssf.gov.bd returns status code 3 (NXDOMAIN), and does not point to any IP addresses at all.
So none of the name servers that the Reverse DNS (arpa) zone has been delegated to are actually reachable, which is why you end up with the latest part of “;; connection timed out; no servers could be reached”.
Since the IP block comes from APNIC, you would have to contact APNIC (and/or use their documentation) to have the delegation of the 30.255.103.in-addr.arpa Reverse DNS (arpa) zone moved to the correct name servers that you intend to use for that Reverse DNS (arpa) zone.