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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.

2001:558:100a:5:68:87:68:244

4.4.2.0.8.6.0.0.7.8.0.0.8.6.0.0.5.0.0.0.a.0.0.1.8.5.5.0.1.0.0.2.ip6.arpa

Zone 8.5.5.0.1.0.0.2.ip6.arpa98 queries in 2.7 s2026-11-09 05:22:51 UTCNot DNSSEC-signed

WHOIS for 2001:558:100a:5:68:87:68:244 →TextJSON
  • Note 8.5.5.0.1.0.0.2.ip6.arpa isn't signed with DNSSEC, so resolvers can't tell forged answers from real ones.

Records

Asked directly of dns101.comcast.net (69.252.250.103), an authoritative server: no cache in between, so these are the live values.

PTR Reverse pointer

7200PTRdns104.comcast.net.
ANY query: 1 records
7200PTRdns104.comcast.net.

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 192.36.148.175.9 ms

    Referral to ip6.arpa. signed (3 DS)

    • e.ip6-servers.arpa 203.119.86.101 2001:dd8:6::101
    • f.ip6-servers.arpa 193.0.9.2 2a13:27c0:30::2
    • c.ip6-servers.arpa 196.216.169.11 2001:43f8:110::11
    • a.ip6-servers.arpa 199.180.182.53 2620:37:e000::53
    • d.ip6-servers.arpa 200.7.86.53 2001:13c7:7012::53
    • b.ip6-servers.arpa 199.253.182.182 2001:500:86::86
  2. ip6.arpa.asked f.ip6-servers.arpa 193.0.9.212 ms

    Referral to 5.0.1.0.0.2.ip6.arpa. signed (1 DS)

    • y.arin.net 192.82.134.30 2001:500:127::30
    • arin.authdns.ripe.net 193.0.9.10 2a13:27c0:30::10
    • 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
    • z.arin.net 199.180.180.63 2001:500:f0::63

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

    196.216.169.11 failed: NOERROR

  3. 5.0.1.0.0.2.ip6.arpa.asked x.arin.net 199.180.180.6389 ms

    Referral to 8.5.5.0.1.0.0.2.ip6.arpa. unsigned delegation

    • dns101.comcast.net 69.252.250.103 2001:558:fe23:8:69:252:250:103
    • dns104.comcast.net 68.87.68.244 2001:558:100a:5:68:87:68:244
    • dns103.comcast.net 68.87.76.228 2001:558:1014:c:68:87:76:228
    • dns102.comcast.net 68.87.85.132 2001:558:1004:7:68:87:85:132
    • dns105.comcast.net 68.87.72.244 2001:558:100e:5:68:87:72:244

    No glue for dns101.comcast.net, dns104.comcast.net, dns103.comcast.net, dns102.comcast.net, dns105.comcast.net: addresses looked up via a resolver.

  4. 8.5.5.0.1.0.0.2.ip6.arpa.asked dns101.comcast.net 69.252.250.103100 ms

    Answer (authoritative):

    4.4.2.0.8.6.0.0.7.8.0.0.8.6.0.0.5.0.0.0.a.0.0.1.8.5.5.0.1.0.0.2.ip6.arpa.7200PTRdns104.comcast.net.

Nameservers

Every address of every nameserver, asked for 8.5.5.0.1.0.0.2.ip6.arpa's SOA. "Parent" means the 5.0.1.0.0.2.ip6.arpa zone delegates to it; "zone" means 8.5.5.0.1.0.0.2.ip6.arpa lists it itself.

NameserverListed inAddressStatusSerialTime
dns101.comcast.netparent + zone69.252.250.103 glueauthoritative49569599 ms
2001:558:fe23:8:69:252:250:103 glueauthoritative49569599 ms
dns102.comcast.netparent + zone68.87.85.132 glueauthoritative495695140 ms
2001:558:1004:7:68:87:85:132 glueauthoritative495695154 ms
dns103.comcast.netparent + zone68.87.76.228 glueauthoritative495695162 ms
2001:558:1014:c:68:87:76:228 glueauthoritative495695156 ms
dns104.comcast.netparent + zone68.87.68.244 glueauthoritative495695121 ms
2001:558:100a:5:68:87:68:244 glueauthoritative495695111 ms
dns105.comcast.netparent + zone68.87.72.244 glueauthoritative495695127 ms
2001:558:100e:5:68:87:72:244 glueauthoritative495695111 ms

DNSSEC

8.5.5.0.1.0.0.2.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)
dns101.comcast.net
nameserver
69.252.250.103dns101.comcast.net ✓
2001:558:fe23:8:69:252:250:103dns101.comcast.net ✓
dns102.comcast.net
nameserver
68.87.85.132dns102.comcast.net ✓
2001:558:1004:7:68:87:85:132dns102.comcast.net ✓
dns103.comcast.net
nameserver
68.87.76.228dns103.comcast.net ✓
2001:558:1014:c:68:87:76:228dns103.comcast.net ✓
dns104.comcast.net
nameserver · PTR target
68.87.68.244dns104.comcast.net ✓
2001:558:100a:5:68:87:68:244dns104.comcast.net ✓
dns105.comcast.net
nameserver
68.87.72.244dns105.comcast.net ✓
2001:558:100e:5:68:87:72:244dns105.comcast.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 1.1.1.1dns104.comcast.net.
TTL 7200
Google 8.8.8.8dns104.comcast.net.
TTL 7200
Quad9 9.9.9.9dns104.comcast.net.
TTL 7200
OpenDNS 208.67.222.222timed out

Text dump

; DNS report for 4.4.2.0.8.6.0.0.7.8.0.0.8.6.0.0.5.0.0.0.a.0.0.1.8.5.5.0.1.0.0.2.ip6.arpa (2001:558:100a:5:68:87:68:244)
; 2026-11-09 05:22:51 UTC, 98 queries in 2.75 s, zone 8.5.5.0.1.0.0.2.ip6.arpa

;; FINDINGS
;  [INFO] 8.5.5.0.1.0.0.2.ip6.arpa isn't signed with DNSSEC, so resolvers can't tell forged answers from real ones.

;; RECORDS (authoritative, from dns101.comcast.net (69.252.250.103))
4.4.2.0.8.6.0.0.7.8.0.0.8.6.0.0.5.0.0.0.a.0.0.1.8.5.5.0.1.0.0.2.ip6.arpa.	7200	IN	PTR	dns104.comcast.net.

;; TRACE
;  4.4.2.0.8.6.0.0.7.8.0.0.8.6.0.0.5.0.0.0.a.0.0.1.8.5.5.0.1.0.0.2.ip6.arpa PTR
;  . @i.root-servers.net (192.36.148.17) 5.9 ms [NOERROR qr]: referral to ip6.arpa.
ip6.arpa.		NS	e.ip6-servers.arpa.	; 203.119.86.101 2001:dd8:6::101
ip6.arpa.		NS	f.ip6-servers.arpa.	; 193.0.9.2 2a13:27c0:30::2
ip6.arpa.		NS	c.ip6-servers.arpa.	; 196.216.169.11 2001:43f8:110::11
ip6.arpa.		NS	a.ip6-servers.arpa.	; 199.180.182.53 2620:37:e000::53
ip6.arpa.		NS	d.ip6-servers.arpa.	; 200.7.86.53 2001:13c7:7012::53
ip6.arpa.		NS	b.ip6-servers.arpa.	; 199.253.182.182 2001:500:86::86
ip6.arpa.	86400	IN	DS	13880 8 2 068554EFCB5861F42AF93EF8E79C442A86C16FC5652E6B6D2419ED527F344D17
ip6.arpa.	86400	IN	DS	64060 8 2 8A11501086330132BE2C23F22DEDF0634AD5FF668B4AA1988E172C6A2A4E5F7B
ip6.arpa.	86400	IN	DS	45094 8 2 E6B54E0A20CE1EDBFCB6879C02F5782059CECB043A31D804A04AFA51AF01D5FB
;  ip6.arpa. @f.ip6-servers.arpa (193.0.9.2) 12 ms [NOERROR qr]: referral to 5.0.1.0.0.2.ip6.arpa.
5.0.1.0.0.2.ip6.arpa.		NS	y.arin.net.	; 192.82.134.30 2001:500:127::30
5.0.1.0.0.2.ip6.arpa.		NS	arin.authdns.ripe.net.	; 193.0.9.10 2a13:27c0:30::10
5.0.1.0.0.2.ip6.arpa.		NS	r.arin.net.	; 199.180.180.63 2001:500:f0::63
5.0.1.0.0.2.ip6.arpa.		NS	x.arin.net.	; 199.180.180.63 2001:500:f0::63
5.0.1.0.0.2.ip6.arpa.		NS	u.arin.net.	; 204.61.216.50 2001:500:14:6050:ad::1
5.0.1.0.0.2.ip6.arpa.		NS	z.arin.net.	; 199.180.180.63 2001:500:f0::63
5.0.1.0.0.2.ip6.arpa.	86400	IN	DS	54676 8 2 FC5F72BAB09F5AC9A30AF8B3B83230A54AE80D0130C2793AF4297C7E4E9D32C1
;  5.0.1.0.0.2.ip6.arpa. @x.arin.net (199.180.180.63) 89 ms [NOERROR qr]: referral to 8.5.5.0.1.0.0.2.ip6.arpa.
8.5.5.0.1.0.0.2.ip6.arpa.		NS	dns101.comcast.net.	; 69.252.250.103 2001:558:fe23:8:69:252:250:103
8.5.5.0.1.0.0.2.ip6.arpa.		NS	dns104.comcast.net.	; 68.87.68.244 2001:558:100a:5:68:87:68:244
8.5.5.0.1.0.0.2.ip6.arpa.		NS	dns103.comcast.net.	; 68.87.76.228 2001:558:1014:c:68:87:76:228
8.5.5.0.1.0.0.2.ip6.arpa.		NS	dns102.comcast.net.	; 68.87.85.132 2001:558:1004:7:68:87:85:132
8.5.5.0.1.0.0.2.ip6.arpa.		NS	dns105.comcast.net.	; 68.87.72.244 2001:558:100e:5:68:87:72:244
;  8.5.5.0.1.0.0.2.ip6.arpa. @dns101.comcast.net (69.252.250.103) 100 ms [NOERROR qr aa]: answer
4.4.2.0.8.6.0.0.7.8.0.0.8.6.0.0.5.0.0.0.a.0.0.1.8.5.5.0.1.0.0.2.ip6.arpa.	7200	IN	PTR	dns104.comcast.net.

;; NAMESERVERS (SOA asked of each address)
;  dns101.comcast.net [parent+zone]
;    69.252.250.103                          ok                        495695      99 ms
;    2001:558:fe23:8:69:252:250:103          ok                        495695      99 ms
;  dns102.comcast.net [parent+zone]
;    68.87.85.132                            ok                        495695      140 ms
;    2001:558:1004:7:68:87:85:132            ok                        495695      154 ms
;  dns103.comcast.net [parent+zone]
;    68.87.76.228                            ok                        495695      162 ms
;    2001:558:1014:c:68:87:76:228            ok                        495695      156 ms
;  dns104.comcast.net [parent+zone]
;    68.87.68.244                            ok                        495695      121 ms
;    2001:558:100a:5:68:87:68:244            ok                        495695      111 ms
;  dns105.comcast.net [parent+zone]
;    68.87.72.244                            ok                        495695      127 ms
;    2001:558:100e:5:68:87:72:244            ok                        495695      111 ms

;; DNSSEC: unsigned

;; HOSTS
;  dns101.comcast.net (nameserver)
;    69.252.250.103                          PTR dns101.comcast.net (confirmed)
;    2001:558:fe23:8:69:252:250:103          PTR dns101.comcast.net (confirmed)
;  dns102.comcast.net (nameserver)
;    68.87.85.132                            PTR dns102.comcast.net (confirmed)
;    2001:558:1004:7:68:87:85:132            PTR dns102.comcast.net (confirmed)
;  dns103.comcast.net (nameserver)
;    68.87.76.228                            PTR dns103.comcast.net (confirmed)
;    2001:558:1014:c:68:87:76:228            PTR dns103.comcast.net (confirmed)
;  dns104.comcast.net (nameserver; PTR target)
;    68.87.68.244                            PTR dns104.comcast.net (confirmed)
;    2001:558:100a:5:68:87:68:244            PTR dns104.comcast.net (confirmed)
;  dns105.comcast.net (nameserver)
;    68.87.72.244                            PTR dns105.comcast.net (confirmed)
;    2001:558:100e:5:68:87:72:244            PTR dns105.comcast.net (confirmed)

;; PUBLIC RESOLVERS
;  Cloudflare PTR   dns104.comcast.net.  ttl 7200
;  Google     PTR   dns104.comcast.net.  ttl 7200
;  Quad9      PTR   dns104.comcast.net.  ttl 7200
;  OpenDNS    PTR   timed out