Reverse DNS Lookup

Untuk mengetahu ada tidaknya Reverse DNS lookup, bisa menggunakan perintah baris nslookup.

Cek nslookup untuk server webmail
MuhSirojuls-MacBook-Air:~ msmunir$ nslookup webmail.ristek.go.id
Server: 180.131.144.144
Address: 180.131.144.144#53

Non-authoritative answer:
Name: webmail.ristek.go.id
Address: 103.56.188.8


Cek Reverse DNS untuk IP 103.56.188.8
MuhSirojuls-MacBook-Air:~ msmunir$ nslookup 103.56.188.8
;; Warning: Message parser reports malformed message packet.
;; Truncated, retrying in TCP mode.
Server: 180.131.144.144
Address: 180.131.144.144#53

** server can't find 8.188.56.103.in-addr.arpa.: NXDOMAIN

Cek nslookup untuk server webmail
MuhSirojuls-MacBook-Air:~ msmunir$ nslookup webmail.ristekdikti.go.id
Server: 180.131.144.144
Address: 180.131.144.144#53

Non-authoritative answer:
Name: webmail.ristekdikti.go.id
Address: 103.56.189.10

Cek Reverse DNS untuk IP 103.56.189.10 
MuhSirojuls-MacBook-Air:~ msmunir$ nslookup 103.56.188.10
;; Warning: Message parser reports malformed message packet.
;; Truncated, retrying in TCP mode.
Server: 180.131.144.144
Address: 180.131.144.144#53

** server can't find 10.188.56.103.in-addr.arpa.: NXDOMAIN

Contoh yang sudah punya Reverse DNS, misal mail server batan
MuhSirojuls-MacBook-Air:~ msmunir$ nslookup mail3.batan.go.id
Server: 180.131.144.144
Address: 180.131.144.144#53

Non-authoritative answer:
Name: mail3.batan.go.id
Address: 223.25.97.94

Cek Reverse DNS untuk IP 223.25.97.94 
MuhSirojuls-MacBook-Air:~ msmunir$ nslookup 223.25.97.94
Server: 180.131.144.144
Address: 180.131.144.144#53

Non-authoritative answer:
94.97.25.223.in-addr.arpa name = 94.97.25.223.iconpln.net.id.

Authoritative answers can be found from:
97.25.223.in-addr.arpa nameserver = ns2.iconpln.net.id.
97.25.223.in-addr.arpa nameserver = ns1.iconpln.net.id.

Permintaan Reverse DNS kepada ISP yang dilanggan. Istilahnya minta PTR record

Contoh lain yang sudah ada Reverse DNS

MuhSirojuls-MacBook-Air:~ msmunir$ nslookup mail.bppt.go.id
Server: 180.131.144.144
Address: 180.131.144.144#53

Non-authoritative answer:
Name: mail.bppt.go.id
Address: 103.224.137.202

MuhSirojuls-MacBook-Air:~ msmunir$ nslookup 103.224.137.202
Server: 180.131.144.144
Address: 180.131.144.144#53

Non-authoritative answer:
202.137.224.103.in-addr.arpa name = zsmtp-in1.bppt.go.id.
202.137.224.103.in-addr.arpa name = zsmtp-out1.bppt.go.id.
202.137.224.103.in-addr.arpa name = mail.bppt.go.id.

Authoritative answers can be found from:
137.224.103.in-addr.arpa nameserver = ns1.bppt.go.id.
137.224.103.in-addr.arpa nameserver = ns.bppt.go.id.