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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.

2a01:111:f403:f90a::4

4.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.a.0.9.f.3.0.4.f.1.1.1.0.1.0.a.2.ip6.arpa

Zone 1.1.1.0.1.0.a.2.ip6.arpa90 queries in 0.8 s2026-11-09 05:35:11 UTCNot DNSSEC-signed

WHOIS for 2a01:111:f403:f90a::4 →TextJSON
  • Note 1.1.1.0.1.0.a.2.ip6.arpa isn't signed with DNSSEC, so resolvers can't tell forged answers from real ones.

Records

Asked directly of ns1-03.azure-dns.com (13.107.236.3), an authoritative server: no cache in between, so these are the live values.

PTR Reverse pointer

3600PTRmail-bnypr04cu00104.inbound.protection.outlook.com.
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 m.root-servers.net 202.12.27.3314 ms

    Referral to ip6.arpa. signed (3 DS)

    • f.ip6-servers.arpa 193.0.9.2 2a13:27c0:30::2
    • d.ip6-servers.arpa 200.7.86.53 2001:13c7:7012::53
    • a.ip6-servers.arpa 199.180.182.53 2620:37:e000::53
    • c.ip6-servers.arpa 196.216.169.11 2001:43f8:110::11
    • b.ip6-servers.arpa 199.253.182.182 2001:500:86::86
    • e.ip6-servers.arpa 203.119.86.101 2001:dd8:6::101

    193.0.14.129 failed: NOERROR

  2. ip6.arpa.asked a.ip6-servers.arpa 199.180.182.5390 ms

    Referral to 0.a.2.ip6.arpa. signed (1 DS)

    • ns3.lacnic.net 200.3.13.14 2001:13c7:7002:3000::14
    • ns3.afrinic.net 204.61.216.100 2001:500:14:6100:ad::1
    • rirns.arin.net 199.253.249.53 2620:38:2000::53
    • pri.authdns.ripe.net 193.0.9.5 2a13:27c0:30::5
    • ns4.apnic.net 202.12.31.53 2001:dd8:12::53

    No glue for ns3.lacnic.net, ns3.afrinic.net, rirns.arin.net, pri.authdns.ripe.net, ns4.apnic.net: addresses looked up via a resolver.

    196.216.169.11 failed: NOERROR

  3. 0.a.2.ip6.arpa.asked ns3.afrinic.net 204.61.216.1005.6 ms

    Referral to 1.1.1.0.1.0.a.2.ip6.arpa. unsigned delegation

    • ns1-03.azure-dns.com 13.107.236.3 2603:1061:0:700::3
    • ns4-03.azure-dns.info 208.84.5.3 2620:1ec:bda:700::3
    • ns3-03.azure-dns.org 204.14.183.3 2a01:111:4000:700::3
    • ns2-03.azure-dns.net 150.171.21.3 2620:1ec:8ec:700::3

    No glue for ns1-03.azure-dns.com, ns4-03.azure-dns.info, ns3-03.azure-dns.org, ns2-03.azure-dns.net: addresses looked up via a resolver.

  4. 1.1.1.0.1.0.a.2.ip6.arpa.asked ns2-03.azure-dns.net 150.171.21.36.5 ms

    Answer (authoritative):

    4.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.a.0.9.f.3.0.4.f.1.1.1.0.1.0.a.2.ip6.arpa.3600PTRmail-bnypr04cu00104.inbound.protection.outlook.com.

Nameservers

Every address of every nameserver, asked for 1.1.1.0.1.0.a.2.ip6.arpa's SOA. "Parent" means the 0.a.2.ip6.arpa zone delegates to it; "zone" means 1.1.1.0.1.0.a.2.ip6.arpa lists it itself.

NameserverListed inAddressStatusSerialTime
ns1-03.azure-dns.comparent + zone13.107.236.3 glueauthoritative16.2 ms
2603:1061:0:700::3 glueauthoritative17.9 ms
ns2-03.azure-dns.netparent + zone150.171.21.3 glueauthoritative16.7 ms
2620:1ec:8ec:700::3 glueauthoritative18.0 ms
ns3-03.azure-dns.orgparent + zone204.14.183.3 glueauthoritative16.7 ms
2a01:111:4000:700::3 glueauthoritative18.3 ms
ns4-03.azure-dns.infoparent + zone208.84.5.3 glueauthoritative16.7 ms
2620:1ec:bda:700::3 glueauthoritative18.6 ms

DNSSEC

1.1.1.0.1.0.a.2.ip6.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)
ns1-03.azure-dns.com
nameserver
13.107.236.3ns1-03.azure-dns.com ✓
2603:1061:0:700::3ns1-03.azure-dns.com ✓
ns2-03.azure-dns.net
nameserver
150.171.21.3ns2-03.azure-dns.net ✓
2620:1ec:8ec:700::3ns2-03.azure-dns.net ✓
ns3-03.azure-dns.org
nameserver
204.14.183.3ns3-03.azure-dns.org ✓
2a01:111:4000:700::3ns3-03.azure-dns.org ✓
ns4-03.azure-dns.info
nameserver
208.84.5.3ns4-03.azure-dns.info ✓
2620:1ec:bda:700::3ns4-03.azure-dns.info ✓
mail-bnypr04cu00104.inbound.protection.outlook.com
PTR target
52.101.60.148mail-bnypr04cu00104.inbound.protection.outlook.com ✓
2a01:111:f403:f90a::4mail-bnypr04cu00104.inbound.protection.outlook.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 1.1.1.1mail-bnypr04cu00104.inbound.protection.outlook.com.
TTL 3600
Google 8.8.8.8mail-bnypr04cu00104.inbound.protection.outlook.com.
TTL 774
Quad9 9.9.9.9mail-bnypr04cu00104.inbound.protection.outlook.com.
TTL 3600
OpenDNS 208.67.222.222mail-bnypr04cu00104.inbound.protection.outlook.com.
TTL 3600

Text dump

; DNS report for 4.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.a.0.9.f.3.0.4.f.1.1.1.0.1.0.a.2.ip6.arpa (2a01:111:f403:f90a::4)
; 2026-11-09 05:35:11 UTC, 90 queries in 0.80 s, zone 1.1.1.0.1.0.a.2.ip6.arpa

;; FINDINGS
;  [INFO] 1.1.1.0.1.0.a.2.ip6.arpa isn't signed with DNSSEC, so resolvers can't tell forged answers from real ones.

;; RECORDS (authoritative, from ns1-03.azure-dns.com (13.107.236.3))
4.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.a.0.9.f.3.0.4.f.1.1.1.0.1.0.a.2.ip6.arpa.	3600	IN	PTR	mail-bnypr04cu00104.inbound.protection.outlook.com.

;; TRACE
;  4.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.a.0.9.f.3.0.4.f.1.1.1.0.1.0.a.2.ip6.arpa PTR
;  . @m.root-servers.net (202.12.27.33) 14 ms [NOERROR qr]: referral to ip6.arpa.
ip6.arpa.		NS	f.ip6-servers.arpa.	; 193.0.9.2 2a13:27c0:30::2
ip6.arpa.		NS	d.ip6-servers.arpa.	; 200.7.86.53 2001:13c7:7012::53
ip6.arpa.		NS	a.ip6-servers.arpa.	; 199.180.182.53 2620:37:e000::53
ip6.arpa.		NS	c.ip6-servers.arpa.	; 196.216.169.11 2001:43f8:110::11
ip6.arpa.		NS	b.ip6-servers.arpa.	; 199.253.182.182 2001:500:86::86
ip6.arpa.		NS	e.ip6-servers.arpa.	; 203.119.86.101 2001:dd8:6::101
ip6.arpa.	86400	IN	DS	13880 8 2 068554EFCB5861F42AF93EF8E79C442A86C16FC5652E6B6D2419ED527F344D17
ip6.arpa.	86400	IN	DS	45094 8 2 E6B54E0A20CE1EDBFCB6879C02F5782059CECB043A31D804A04AFA51AF01D5FB
ip6.arpa.	86400	IN	DS	64060 8 2 8A11501086330132BE2C23F22DEDF0634AD5FF668B4AA1988E172C6A2A4E5F7B
;  ip6.arpa. @a.ip6-servers.arpa (199.180.182.53) 90 ms [NOERROR qr]: referral to 0.a.2.ip6.arpa.
0.a.2.ip6.arpa.		NS	ns3.lacnic.net.	; 200.3.13.14 2001:13c7:7002:3000::14
0.a.2.ip6.arpa.		NS	ns3.afrinic.net.	; 204.61.216.100 2001:500:14:6100:ad::1
0.a.2.ip6.arpa.		NS	rirns.arin.net.	; 199.253.249.53 2620:38:2000::53
0.a.2.ip6.arpa.		NS	pri.authdns.ripe.net.	; 193.0.9.5 2a13:27c0:30::5
0.a.2.ip6.arpa.		NS	ns4.apnic.net.	; 202.12.31.53 2001:dd8:12::53
0.a.2.ip6.arpa.	86400	IN	DS	6737 13 2 F346C2BE7A1D04F367DC2B24556FA5F6AE515F4C005C7D44508B31E8D79C9694
;  0.a.2.ip6.arpa. @ns3.afrinic.net (204.61.216.100) 5.6 ms [NOERROR qr]: referral to 1.1.1.0.1.0.a.2.ip6.arpa.
1.1.1.0.1.0.a.2.ip6.arpa.		NS	ns1-03.azure-dns.com.	; 13.107.236.3 2603:1061:0:700::3
1.1.1.0.1.0.a.2.ip6.arpa.		NS	ns4-03.azure-dns.info.	; 208.84.5.3 2620:1ec:bda:700::3
1.1.1.0.1.0.a.2.ip6.arpa.		NS	ns3-03.azure-dns.org.	; 204.14.183.3 2a01:111:4000:700::3
1.1.1.0.1.0.a.2.ip6.arpa.		NS	ns2-03.azure-dns.net.	; 150.171.21.3 2620:1ec:8ec:700::3
;  1.1.1.0.1.0.a.2.ip6.arpa. @ns2-03.azure-dns.net (150.171.21.3) 6.5 ms [NOERROR qr aa]: answer
4.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.a.0.9.f.3.0.4.f.1.1.1.0.1.0.a.2.ip6.arpa.	3600	IN	PTR	mail-bnypr04cu00104.inbound.protection.outlook.com.

;; NAMESERVERS (SOA asked of each address)
;  ns1-03.azure-dns.com [parent+zone]
;    13.107.236.3                            ok                        1           6.2 ms
;    2603:1061:0:700::3                      ok                        1           7.9 ms
;  ns2-03.azure-dns.net [parent+zone]
;    150.171.21.3                            ok                        1           6.7 ms
;    2620:1ec:8ec:700::3                     ok                        1           8.0 ms
;  ns3-03.azure-dns.org [parent+zone]
;    204.14.183.3                            ok                        1           6.7 ms
;    2a01:111:4000:700::3                    ok                        1           8.3 ms
;  ns4-03.azure-dns.info [parent+zone]
;    208.84.5.3                              ok                        1           6.7 ms
;    2620:1ec:bda:700::3                     ok                        1           8.6 ms

;; DNSSEC: unsigned

;; HOSTS
;  ns1-03.azure-dns.com (nameserver)
;    13.107.236.3                            PTR ns1-03.azure-dns.com (confirmed)
;    2603:1061:0:700::3                      PTR ns1-03.azure-dns.com (confirmed)
;  ns2-03.azure-dns.net (nameserver)
;    150.171.21.3                            PTR ns2-03.azure-dns.net (confirmed)
;    2620:1ec:8ec:700::3                     PTR ns2-03.azure-dns.net (confirmed)
;  ns3-03.azure-dns.org (nameserver)
;    204.14.183.3                            PTR ns3-03.azure-dns.org (confirmed)
;    2a01:111:4000:700::3                    PTR ns3-03.azure-dns.org (confirmed)
;  ns4-03.azure-dns.info (nameserver)
;    208.84.5.3                              PTR ns4-03.azure-dns.info (confirmed)
;    2620:1ec:bda:700::3                     PTR ns4-03.azure-dns.info (confirmed)
;  mail-bnypr04cu00104.inbound.protection.outlook.com (PTR target)
;    52.101.60.148                           PTR mail-bnypr04cu00104.inbound.protection.outlook.com (confirmed)
;    2a01:111:f403:f90a::4                   PTR mail-bnypr04cu00104.inbound.protection.outlook.com (confirmed)

;; PUBLIC RESOLVERS
;  Cloudflare PTR   mail-bnypr04cu00104.inbound.protection.outlook.com.  ttl 3600
;  Google     PTR   mail-bnypr04cu00104.inbound.protection.outlook.com.  ttl 774
;  Quad9      PTR   mail-bnypr04cu00104.inbound.protection.outlook.com.  ttl 3600
;  OpenDNS    PTR   mail-bnypr04cu00104.inbound.protection.outlook.com.  ttl 3600