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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.

150.171.21.2

2.21.171.150.in-addr.arpa

Zone 171.150.in-addr.arpa90 queries in 0.9 s2026-11-09 05:54:56 UTCNot DNSSEC-signed

WHOIS for 150.171.21.2 →TextJSON
  • Note 171.150.in-addr.arpa isn't signed with DNSSEC, so resolvers can't tell forged answers from real ones.

Records

Asked directly of ns1-07.azure-dns.com (13.107.236.7), an authoritative server: no cache in between, so these are the live values.

PTR Reverse pointer

3600PTRns2-02.azure-dns.net.
ANY query: refused politely (RFC 8482)
300HINFO"RFC8482" ""

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 i.root-servers.net 192.36.148.175.8 ms

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

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

    192.5.5.241 failed: NOERROR

  2. in-addr.arpa.asked f.in-addr-servers.arpa 193.0.9.111 ms

    Referral to 150.in-addr.arpa. signed (1 DS)

    • ns1.apnic.net 203.119.42.53 2001:dd8:e::53
    • ns2.apnic.net 203.119.95.53 2001:ddd::53
    • ns3.lacnic.net 200.3.13.14 2001:13c7:7002:3000::14
    • apnic.authdns.ripe.net 193.0.9.9 2a13:27c0:30::9
    • rirns.arin.net 199.253.249.53 2620:38:2000::53

    No glue for ns1.apnic.net, ns2.apnic.net, ns3.lacnic.net, apnic.authdns.ripe.net, rirns.arin.net: addresses looked up via a resolver.

  3. 150.in-addr.arpa.asked ns1.apnic.net 203.119.42.53169 ms

    Referral to 171.150.in-addr.arpa. unsigned delegation

    • ns2-07.azure-dns.net 150.171.21.7 2620:1ec:8ec:700::7
    • ns4-07.azure-dns.info 208.84.5.7 2620:1ec:bda: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 ns2-07.azure-dns.net, ns4-07.azure-dns.info, ns1-07.azure-dns.com, ns3-07.azure-dns.org: addresses looked up via a resolver.

  4. 171.150.in-addr.arpa.asked ns2-07.azure-dns.net 150.171.21.76.4 ms

    Answer (authoritative):

    2.21.171.150.in-addr.arpa.3600PTRns2-02.azure-dns.net.

    204.14.183.7 failed: NOERROR

Nameservers

Every address of every nameserver, asked for 171.150.in-addr.arpa's SOA. "Parent" means the 150.in-addr.arpa zone delegates to it; "zone" means 171.150.in-addr.arpa lists it itself.

NameserverListed inAddressStatusSerialTime
ns1-07.azure-dns.comparent + zone13.107.236.7 glueauthoritative16.6 ms
2603:1061:0:700::7 glueauthoritative16.3 ms
ns2-07.azure-dns.netparent + zone150.171.21.7 glueauthoritative17.2 ms
2620:1ec:8ec:700::7 glueauthoritative17.2 ms
ns3-07.azure-dns.orgparent + zone204.14.183.7 glueauthoritative17.4 ms
2a01:111:4000:700::7 glueauthoritative17.3 ms
ns4-07.azure-dns.infoparent + zone208.84.5.7 glueauthoritative17.3 ms
2620:1ec:bda:700::7 glueauthoritative17.3 ms

DNSSEC

171.150.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 ✓
ns2-02.azure-dns.net
PTR target
150.171.21.2ns2-02.azure-dns.net ✓
2620:1ec:8ec:700::2ns2-02.azure-dns.net ✓

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 1.1.1.1ns2-02.azure-dns.net.
TTL 3600
Google 8.8.8.8ns2-02.azure-dns.net.
TTL 2905
Quad9 9.9.9.9ns2-02.azure-dns.net.
TTL 3600
OpenDNS 208.67.222.222ns2-02.azure-dns.net.
TTL 3600

Text dump

; DNS report for 2.21.171.150.in-addr.arpa (150.171.21.2)
; 2026-11-09 05:54:56 UTC, 90 queries in 0.91 s, zone 171.150.in-addr.arpa

;; FINDINGS
;  [INFO] 171.150.in-addr.arpa isn't signed with DNSSEC, so resolvers can't tell forged answers from real ones.

;; RECORDS (authoritative, from ns1-07.azure-dns.com (13.107.236.7))
2.21.171.150.in-addr.arpa.	3600	IN	PTR	ns2-02.azure-dns.net.

;; TRACE
;  2.21.171.150.in-addr.arpa PTR
;  . @i.root-servers.net (192.36.148.17) 5.8 ms [NOERROR qr]: referral to in-addr.arpa.
in-addr.arpa.		NS	b.in-addr-servers.arpa.	; 199.253.183.183 2001:500:87::87
in-addr.arpa.		NS	a.in-addr-servers.arpa.	; 199.180.182.53 2620:37:e000::53
in-addr.arpa.		NS	f.in-addr-servers.arpa.	; 193.0.9.1 2a13:27c0:30::1
in-addr.arpa.		NS	e.in-addr-servers.arpa.	; 203.119.86.101 2001:dd8:6::101
in-addr.arpa.		NS	c.in-addr-servers.arpa.	; 196.216.169.10 2001:43f8:110::10
in-addr.arpa.		NS	d.in-addr-servers.arpa.	; 200.10.60.53 2001:13c7:7010::53
in-addr.arpa.	86400	IN	DS	53696 8 2 13E5501C56B20394DA921B51412D48B7089C5EB6957A7C58553C4D4D424F04DF
in-addr.arpa.	86400	IN	DS	63982 8 2 AAF4FB5D213EF25AE44679032EBE3514C487D7ABD99D7F5FEC3383D030733C73
in-addr.arpa.	86400	IN	DS	47054 8 2 5CAFCCEC201D1933B4C9F6A9C8F51E51F3B39979058AC21B8DF1B1F281CBC6F2
in-addr.arpa.	86400	IN	DS	54956 8 2 E0E2BF5CFBD66572CA05EC18267D91509BA6A9405AF05C3FD4141DFA45200C08
;  in-addr.arpa. @f.in-addr-servers.arpa (193.0.9.1) 11 ms [NOERROR qr]: referral to 150.in-addr.arpa.
150.in-addr.arpa.		NS	ns1.apnic.net.	; 203.119.42.53 2001:dd8:e::53
150.in-addr.arpa.		NS	ns2.apnic.net.	; 203.119.95.53 2001:ddd::53
150.in-addr.arpa.		NS	ns3.lacnic.net.	; 200.3.13.14 2001:13c7:7002:3000::14
150.in-addr.arpa.		NS	apnic.authdns.ripe.net.	; 193.0.9.9 2a13:27c0:30::9
150.in-addr.arpa.		NS	rirns.arin.net.	; 199.253.249.53 2620:38:2000::53
150.in-addr.arpa.	86400	IN	DS	61116 13 2 EE18DE240249371AE86D9DE202E8AF735A02FBFA27A5535F8898BD64BE0D74E8
;  150.in-addr.arpa. @ns1.apnic.net (203.119.42.53) 169 ms [NOERROR qr]: referral to 171.150.in-addr.arpa.
171.150.in-addr.arpa.		NS	ns2-07.azure-dns.net.	; 150.171.21.7 2620:1ec:8ec:700::7
171.150.in-addr.arpa.		NS	ns4-07.azure-dns.info.	; 208.84.5.7 2620:1ec:bda:700::7
171.150.in-addr.arpa.		NS	ns1-07.azure-dns.com.	; 13.107.236.7 2603:1061:0:700::7
171.150.in-addr.arpa.		NS	ns3-07.azure-dns.org.	; 204.14.183.7 2a01:111:4000:700::7
;  171.150.in-addr.arpa. @ns2-07.azure-dns.net (150.171.21.7) 6.4 ms [NOERROR qr aa ad]: answer
2.21.171.150.in-addr.arpa.	3600	IN	PTR	ns2-02.azure-dns.net.

;; NAMESERVERS (SOA asked of each address)
;  ns1-07.azure-dns.com [parent+zone]
;    13.107.236.7                            ok                        1           6.6 ms
;    2603:1061:0:700::7                      ok                        1           6.3 ms
;  ns2-07.azure-dns.net [parent+zone]
;    150.171.21.7                            ok                        1           7.2 ms
;    2620:1ec:8ec:700::7                     ok                        1           7.2 ms
;  ns3-07.azure-dns.org [parent+zone]
;    204.14.183.7                            ok                        1           7.4 ms
;    2a01:111:4000:700::7                    ok                        1           7.3 ms
;  ns4-07.azure-dns.info [parent+zone]
;    208.84.5.7                              ok                        1           7.3 ms
;    2620:1ec:bda:700::7                     ok                        1           7.3 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)
;  ns2-02.azure-dns.net (PTR target)
;    150.171.21.2                            PTR ns2-02.azure-dns.net (confirmed)
;    2620:1ec:8ec:700::2                     PTR ns2-02.azure-dns.net (confirmed)

;; PUBLIC RESOLVERS
;  Cloudflare PTR   ns2-02.azure-dns.net.  ttl 3600
;  Google     PTR   ns2-02.azure-dns.net.  ttl 2905
;  Quad9      PTR   ns2-02.azure-dns.net.  ttl 3600
;  OpenDNS    PTR   ns2-02.azure-dns.net.  ttl 3600