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DNS lookup

Everything DNS says about a domain: traced from the root servers down, every record type asked of the domain's own nameservers, each nameserver checked, then every hostname and policy record it points at followed, with SPF, DMARC, DKIM and DNSSEC checked along the way.

Try example.com, gmail.com, www.github.com, dnssec-failed.org, 1.1.1.1. A URL, e-mail address or IP address works too.

13.107.236.4

4.236.107.13.in-addr.arpa

Zone 107.13.in-addr.arpa101 queries in 2.1 s2026-11-09 06:11:16 UTCNot DNSSEC-signed

WHOIS for 13.107.236.4 →TextJSON
  • Note 107.13.in-addr.arpa isn't signed with DNSSEC, so resolvers can't tell forged answers from real ones.

Records

Asked directly of ns2-07.azure-dns.net (150.171.21.7), an authoritative server: no cache in between, so these are the live values.

PTR Reverse pointer

3600PTRns1-04.azure-dns.com.

No records of type A, AAAA, CNAME, DNAME, NS, SOA, MX, TXT, CAA, HTTPS, SVCB, SRV, NAPTR, DS, DNSKEY, CDS, CDNSKEY, NSEC3PARAM, TLSA, SSHFP, LOC, HINFO, RP, URI, SPF, OPENPGPKEY, ZONEMD, CSYNC.

Resolution trace

  1. .asked a.root-servers.net 198.41.0.412 ms

    Referral to in-addr.arpa. signed (4 DS)

    • f.in-addr-servers.arpa 193.0.9.1 2a13:27c0:30::1
    • b.in-addr-servers.arpa 199.253.183.183 2001:500:87::87
    • d.in-addr-servers.arpa 200.10.60.53 2001:13c7:7010::53
    • a.in-addr-servers.arpa 199.180.182.53 2620:37:e000::53
    • c.in-addr-servers.arpa 196.216.169.10 2001:43f8:110::10
    • e.in-addr-servers.arpa 203.119.86.101 2001:dd8:6::101

    202.12.27.33 failed: NOERROR

  2. in-addr.arpa.asked f.in-addr-servers.arpa 193.0.9.112 ms

    Referral to 13.in-addr.arpa. signed (1 DS)

    • arin.authdns.ripe.net 193.0.9.10 2a13:27c0:30::10
    • z.arin.net 199.180.180.63 2001:500:f0::63
    • y.arin.net 192.82.134.30 2001:500:127::30
    • r.arin.net 199.180.180.63 2001:500:f0::63
    • x.arin.net 199.180.180.63 2001:500:f0::63
    • u.arin.net 204.61.216.50 2001:500:14:6050:ad::1

    No glue for arin.authdns.ripe.net, z.arin.net, y.arin.net, r.arin.net, x.arin.net, u.arin.net: addresses looked up via a resolver.

  3. 13.in-addr.arpa.asked y.arin.net 192.82.134.305.9 ms

    Referral to 107.13.in-addr.arpa. unsigned delegation

    • ns4-07.azure-dns.info 208.84.5.7 2620:1ec:bda:700::7
    • ns2-07.azure-dns.net 150.171.21.7 2620:1ec:8ec:700::7
    • ns1-07.azure-dns.com 13.107.236.7 2603:1061:0:700::7
    • ns3-07.azure-dns.org 204.14.183.7 2a01:111:4000:700::7

    No glue for ns4-07.azure-dns.info, ns2-07.azure-dns.net, ns1-07.azure-dns.com, ns3-07.azure-dns.org: addresses looked up via a resolver.

  4. 107.13.in-addr.arpa.asked ns1-07.azure-dns.com 13.107.236.76.2 ms

    Answer (authoritative):

    4.236.107.13.in-addr.arpa.3600PTRns1-04.azure-dns.com.

    204.14.183.7 failed: NOERROR

Nameservers

Every address of every nameserver, asked for 107.13.in-addr.arpa's SOA. "Parent" means the 13.in-addr.arpa zone delegates to it; "zone" means 107.13.in-addr.arpa lists it itself.

NameserverListed inAddressStatusSerialTime
ns1-07.azure-dns.comparent + zone13.107.236.7 glueauthoritative16.5 ms
2603:1061:0:700::7 glueauthoritative16.4 ms
ns2-07.azure-dns.netparent + zone150.171.21.7 glueauthoritative16.3 ms
2620:1ec:8ec:700::7 glueauthoritative16.6 ms
ns3-07.azure-dns.orgparent + zone204.14.183.7 glueauthoritative16.6 ms
2a01:111:4000:700::7 glueauthoritative16.6 ms
ns4-07.azure-dns.infoparent + zone208.84.5.7 glueauthoritative16.6 ms
2620:1ec:bda:700::7 glueauthoritative16.6 ms

DNSSEC

107.13.in-addr.arpa isn't signed: no DS at the parent and no DNSKEY in the zone.

Hosts and reverse DNS

Every hostname the records point at, resolved to its addresses; each address's PTR (reverse DNS), with ✓ where the PTR name resolves back to the same address.

HostAddressReverse DNS (PTR)
ns1-07.azure-dns.com
nameserver
13.107.236.7ns1-07.azure-dns.com ✓
2603:1061:0:700::7ns1-07.azure-dns.com ✓
ns2-07.azure-dns.net
nameserver
150.171.21.7ns2-07.azure-dns.net ✓
2620:1ec:8ec:700::7ns2-07.azure-dns.net ✓
ns3-07.azure-dns.org
nameserver
204.14.183.7ns3-07.azure-dns.org ✓
2a01:111:4000:700::7ns3-07.azure-dns.org ✓
ns4-07.azure-dns.info
nameserver
208.84.5.7ns4-07.azure-dns.info ✓
2620:1ec:bda:700::7ns4-07.azure-dns.info ✓
ns1-04.azure-dns.com
PTR target
13.107.236.4ns1-04.azure-dns.com ✓
2603:1061:0:700::4ns1-04.azure-dns.com ✓

Public resolvers

What four public resolvers answer right now, from their caches. Highlighted values differ from the authoritative answer: either a recent change they haven't picked up yet (the TTL says how long until they do), or, for A and AAAA, a CDN or geo-routed site handing each resolver location its own addresses.

ResolverPTR
Cloudflare 1.1.1.1ns1-04.azure-dns.com.
TTL 3600
Google 8.8.8.8ns1-04.azure-dns.com.
TTL 751
Quad9 9.9.9.9ns1-04.azure-dns.com.
TTL 2661
OpenDNS 208.67.222.222ns1-04.azure-dns.com.
TTL 315

Text dump

; DNS report for 4.236.107.13.in-addr.arpa (13.107.236.4)
; 2026-11-09 06:11:16 UTC, 101 queries in 2.07 s, zone 107.13.in-addr.arpa

;; FINDINGS
;  [INFO] 107.13.in-addr.arpa isn't signed with DNSSEC, so resolvers can't tell forged answers from real ones.

;; RECORDS (authoritative, from ns2-07.azure-dns.net (150.171.21.7))
4.236.107.13.in-addr.arpa.	3600	IN	PTR	ns1-04.azure-dns.com.

;; TRACE
;  4.236.107.13.in-addr.arpa PTR
;  . @a.root-servers.net (198.41.0.4) 12 ms [NOERROR qr]: referral to in-addr.arpa.
in-addr.arpa.		NS	f.in-addr-servers.arpa.	; 193.0.9.1 2a13:27c0:30::1
in-addr.arpa.		NS	b.in-addr-servers.arpa.	; 199.253.183.183 2001:500:87::87
in-addr.arpa.		NS	d.in-addr-servers.arpa.	; 200.10.60.53 2001:13c7:7010::53
in-addr.arpa.		NS	a.in-addr-servers.arpa.	; 199.180.182.53 2620:37:e000::53
in-addr.arpa.		NS	c.in-addr-servers.arpa.	; 196.216.169.10 2001:43f8:110::10
in-addr.arpa.		NS	e.in-addr-servers.arpa.	; 203.119.86.101 2001:dd8:6::101
in-addr.arpa.	86400	IN	DS	63982 8 2 AAF4FB5D213EF25AE44679032EBE3514C487D7ABD99D7F5FEC3383D030733C73
in-addr.arpa.	86400	IN	DS	53696 8 2 13E5501C56B20394DA921B51412D48B7089C5EB6957A7C58553C4D4D424F04DF
in-addr.arpa.	86400	IN	DS	54956 8 2 E0E2BF5CFBD66572CA05EC18267D91509BA6A9405AF05C3FD4141DFA45200C08
in-addr.arpa.	86400	IN	DS	47054 8 2 5CAFCCEC201D1933B4C9F6A9C8F51E51F3B39979058AC21B8DF1B1F281CBC6F2
;  in-addr.arpa. @f.in-addr-servers.arpa (193.0.9.1) 12 ms [NOERROR qr]: referral to 13.in-addr.arpa.
13.in-addr.arpa.		NS	arin.authdns.ripe.net.	; 193.0.9.10 2a13:27c0:30::10
13.in-addr.arpa.		NS	z.arin.net.	; 199.180.180.63 2001:500:f0::63
13.in-addr.arpa.		NS	y.arin.net.	; 192.82.134.30 2001:500:127::30
13.in-addr.arpa.		NS	r.arin.net.	; 199.180.180.63 2001:500:f0::63
13.in-addr.arpa.		NS	x.arin.net.	; 199.180.180.63 2001:500:f0::63
13.in-addr.arpa.		NS	u.arin.net.	; 204.61.216.50 2001:500:14:6050:ad::1
13.in-addr.arpa.	86400	IN	DS	52567 8 2 3B7BEF1AD097B735292D91E4F91FE499F5A7188B6061B202C920B27202525EB9
;  13.in-addr.arpa. @y.arin.net (192.82.134.30) 5.9 ms [NOERROR qr]: referral to 107.13.in-addr.arpa.
107.13.in-addr.arpa.		NS	ns4-07.azure-dns.info.	; 208.84.5.7 2620:1ec:bda:700::7
107.13.in-addr.arpa.		NS	ns2-07.azure-dns.net.	; 150.171.21.7 2620:1ec:8ec:700::7
107.13.in-addr.arpa.		NS	ns1-07.azure-dns.com.	; 13.107.236.7 2603:1061:0:700::7
107.13.in-addr.arpa.		NS	ns3-07.azure-dns.org.	; 204.14.183.7 2a01:111:4000:700::7
;  107.13.in-addr.arpa. @ns1-07.azure-dns.com (13.107.236.7) 6.2 ms [NOERROR qr aa ad]: answer
4.236.107.13.in-addr.arpa.	3600	IN	PTR	ns1-04.azure-dns.com.

;; NAMESERVERS (SOA asked of each address)
;  ns1-07.azure-dns.com [parent+zone]
;    13.107.236.7                            ok                        1           6.5 ms
;    2603:1061:0:700::7                      ok                        1           6.4 ms
;  ns2-07.azure-dns.net [parent+zone]
;    150.171.21.7                            ok                        1           6.3 ms
;    2620:1ec:8ec:700::7                     ok                        1           6.6 ms
;  ns3-07.azure-dns.org [parent+zone]
;    204.14.183.7                            ok                        1           6.6 ms
;    2a01:111:4000:700::7                    ok                        1           6.6 ms
;  ns4-07.azure-dns.info [parent+zone]
;    208.84.5.7                              ok                        1           6.6 ms
;    2620:1ec:bda:700::7                     ok                        1           6.6 ms

;; DNSSEC: unsigned

;; HOSTS
;  ns1-07.azure-dns.com (nameserver)
;    13.107.236.7                            PTR ns1-07.azure-dns.com (confirmed)
;    2603:1061:0:700::7                      PTR ns1-07.azure-dns.com (confirmed)
;  ns2-07.azure-dns.net (nameserver)
;    150.171.21.7                            PTR ns2-07.azure-dns.net (confirmed)
;    2620:1ec:8ec:700::7                     PTR ns2-07.azure-dns.net (confirmed)
;  ns3-07.azure-dns.org (nameserver)
;    204.14.183.7                            PTR ns3-07.azure-dns.org (confirmed)
;    2a01:111:4000:700::7                    PTR ns3-07.azure-dns.org (confirmed)
;  ns4-07.azure-dns.info (nameserver)
;    208.84.5.7                              PTR ns4-07.azure-dns.info (confirmed)
;    2620:1ec:bda:700::7                     PTR ns4-07.azure-dns.info (confirmed)
;  ns1-04.azure-dns.com (PTR target)
;    13.107.236.4                            PTR ns1-04.azure-dns.com (confirmed)
;    2603:1061:0:700::4                      PTR ns1-04.azure-dns.com (confirmed)

;; PUBLIC RESOLVERS
;  Cloudflare PTR   ns1-04.azure-dns.com.  ttl 3600
;  Google     PTR   ns1-04.azure-dns.com.  ttl 751
;  Quad9      PTR   ns1-04.azure-dns.com.  ttl 2661
;  OpenDNS    PTR   ns1-04.azure-dns.com.  ttl 315