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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.

204.74.101.1

1.101.74.204.in-addr.arpa

Zone 101.74.204.in-addr.arpa72 queries in 0.9 s2026-11-09 06:03:13 UTCNot DNSSEC-signed

WHOIS for 204.74.101.1 →TextJSON
  • Note 101.74.204.in-addr.arpa isn't signed with DNSSEC, so resolvers can't tell forged answers from real ones.

Records

Asked directly of udns1.ultradns.net (204.69.234.1), an authoritative server: no cache in between, so these are the live values.

PTR Reverse pointer

86400PTRudns2.ultradns.net.
ANY query: refused politely (RFC 8482)
3600HINFO"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 k.root-servers.net 193.0.14.12939 ms

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

    • a.in-addr-servers.arpa 199.180.182.53 2620:37:e000::53
    • b.in-addr-servers.arpa 199.253.183.183 2001:500:87::87
    • e.in-addr-servers.arpa 203.119.86.101 2001:dd8:6::101
    • d.in-addr-servers.arpa 200.10.60.53 2001:13c7:7010::53
    • c.in-addr-servers.arpa 196.216.169.10 2001:43f8:110::10
    • f.in-addr-servers.arpa 193.0.9.1 2a13:27c0:30::1
  2. in-addr.arpa.asked b.in-addr-servers.arpa 199.253.183.1836.0 ms

    Referral to 204.in-addr.arpa. signed (1 DS)

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

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

  3. 204.in-addr.arpa.asked arin.authdns.ripe.net 193.0.9.1011 ms

    Referral to 101.74.204.in-addr.arpa. unsigned delegation

    • udns1.ultradns.net 204.69.234.1 2001:502:f3ff::d
    • udns2.ultradns.net 204.74.101.1 2610:a1:1014::d

    No glue for udns1.ultradns.net, udns2.ultradns.net: addresses looked up via a resolver.

  4. 101.74.204.in-addr.arpa.asked udns1.ultradns.net 204.69.234.15.6 ms

    Answer (authoritative):

    1.101.74.204.in-addr.arpa.86400PTRudns2.ultradns.net.

    204.74.101.1 failed: NOERROR

Nameservers

Every address of every nameserver, asked for 101.74.204.in-addr.arpa's SOA. "Parent" means the 204.in-addr.arpa zone delegates to it; "zone" means 101.74.204.in-addr.arpa lists it itself.

NameserverListed inAddressStatusSerialTime
udns1.ultradns.netparent + zone204.69.234.1 glueauthoritative20120309025.6 ms
2001:502:f3ff::d glueauthoritative20120309025.8 ms
udns2.ultradns.netparent + zone204.74.101.1 glueauthoritative201203090229 ms
2610:a1:1014::d glueauthoritative20120309025.7 ms

DNSSEC

101.74.204.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)
udns1.ultradns.net
nameserver
204.69.234.1udns1.ultradns.net ✓
2001:502:f3ff::dudns1.ultradns.net ✓
udns2.ultradns.net
nameserver · PTR target
204.74.101.1udns2.ultradns.net ✓
2610:a1:1014::dudns2.ultradns.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 1.1.1.1udns2.ultradns.net.
TTL 86400
Google 8.8.8.8udns2.ultradns.net.
TTL 21600
Quad9 9.9.9.9udns2.ultradns.net.
TTL 43200
OpenDNS 208.67.222.222udns2.ultradns.net.
TTL 86400

Text dump

; DNS report for 1.101.74.204.in-addr.arpa (204.74.101.1)
; 2026-11-09 06:03:13 UTC, 72 queries in 0.91 s, zone 101.74.204.in-addr.arpa

;; FINDINGS
;  [INFO] 101.74.204.in-addr.arpa isn't signed with DNSSEC, so resolvers can't tell forged answers from real ones.

;; RECORDS (authoritative, from udns1.ultradns.net (204.69.234.1))
1.101.74.204.in-addr.arpa.	86400	IN	PTR	udns2.ultradns.net.

;; TRACE
;  1.101.74.204.in-addr.arpa PTR
;  . @k.root-servers.net (193.0.14.129) 39 ms [NOERROR qr]: referral to in-addr.arpa.
in-addr.arpa.		NS	a.in-addr-servers.arpa.	; 199.180.182.53 2620:37:e000::53
in-addr.arpa.		NS	b.in-addr-servers.arpa.	; 199.253.183.183 2001:500:87::87
in-addr.arpa.		NS	e.in-addr-servers.arpa.	; 203.119.86.101 2001:dd8:6::101
in-addr.arpa.		NS	d.in-addr-servers.arpa.	; 200.10.60.53 2001:13c7:7010::53
in-addr.arpa.		NS	c.in-addr-servers.arpa.	; 196.216.169.10 2001:43f8:110::10
in-addr.arpa.		NS	f.in-addr-servers.arpa.	; 193.0.9.1 2a13:27c0:30::1
in-addr.arpa.	86400	IN	DS	54956 8 2 E0E2BF5CFBD66572CA05EC18267D91509BA6A9405AF05C3FD4141DFA45200C08
in-addr.arpa.	86400	IN	DS	53696 8 2 13E5501C56B20394DA921B51412D48B7089C5EB6957A7C58553C4D4D424F04DF
in-addr.arpa.	86400	IN	DS	47054 8 2 5CAFCCEC201D1933B4C9F6A9C8F51E51F3B39979058AC21B8DF1B1F281CBC6F2
in-addr.arpa.	86400	IN	DS	63982 8 2 AAF4FB5D213EF25AE44679032EBE3514C487D7ABD99D7F5FEC3383D030733C73
;  in-addr.arpa. @b.in-addr-servers.arpa (199.253.183.183) 6.0 ms [NOERROR qr]: referral to 204.in-addr.arpa.
204.in-addr.arpa.		NS	r.arin.net.	; 199.180.180.63 2001:500:f0::63
204.in-addr.arpa.		NS	u.arin.net.	; 204.61.216.50 2001:500:14:6050:ad::1
204.in-addr.arpa.		NS	x.arin.net.	; 199.180.180.63 2001:500:f0::63
204.in-addr.arpa.		NS	y.arin.net.	; 192.82.134.30 2001:500:127::30
204.in-addr.arpa.		NS	z.arin.net.	; 199.180.180.63 2001:500:f0::63
204.in-addr.arpa.		NS	arin.authdns.ripe.net.	; 193.0.9.10 2a13:27c0:30::10
204.in-addr.arpa.	86400	IN	DS	16354 8 2 9D0810993F70DAE9B86EAECAB3CFBBB48BCAF0A35C5288548C95A9D9F8C7EDE2
;  204.in-addr.arpa. @arin.authdns.ripe.net (193.0.9.10) 11 ms [NOERROR qr]: referral to 101.74.204.in-addr.arpa.
101.74.204.in-addr.arpa.		NS	udns1.ultradns.net.	; 204.69.234.1 2001:502:f3ff::d
101.74.204.in-addr.arpa.		NS	udns2.ultradns.net.	; 204.74.101.1 2610:a1:1014::d
;  101.74.204.in-addr.arpa. @udns1.ultradns.net (204.69.234.1) 5.6 ms [NOERROR qr aa]: answer
1.101.74.204.in-addr.arpa.	86400	IN	PTR	udns2.ultradns.net.

;; NAMESERVERS (SOA asked of each address)
;  udns1.ultradns.net [parent+zone]
;    204.69.234.1                            ok                        2012030902  5.6 ms
;    2001:502:f3ff::d                        ok                        2012030902  5.8 ms
;  udns2.ultradns.net [parent+zone]
;    204.74.101.1                            ok                        2012030902  29 ms
;    2610:a1:1014::d                         ok                        2012030902  5.7 ms

;; DNSSEC: unsigned

;; HOSTS
;  udns1.ultradns.net (nameserver)
;    204.69.234.1                            PTR udns1.ultradns.net (confirmed)
;    2001:502:f3ff::d                        PTR udns1.ultradns.net (confirmed)
;  udns2.ultradns.net (nameserver; PTR target)
;    204.74.101.1                            PTR udns2.ultradns.net (confirmed)
;    2610:a1:1014::d                         PTR udns2.ultradns.net (confirmed)

;; PUBLIC RESOLVERS
;  Cloudflare PTR   udns2.ultradns.net.  ttl 86400
;  Google     PTR   udns2.ultradns.net.  ttl 21600
;  Quad9      PTR   udns2.ultradns.net.  ttl 43200
;  OpenDNS    PTR   udns2.ultradns.net.  ttl 86400