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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.

1.0.0.1

1.0.0.1.in-addr.arpa

Zone 0.0.1.in-addr.arpa100 queries in 0.7 s2026-11-09 05:22:44 UTCNot DNSSEC-signed

WHOIS for 1.0.0.1 →TextJSON
  • Note 0.0.1.in-addr.arpa isn't signed with DNSSEC, so resolvers can't tell forged answers from real ones.

Records

Asked directly of jasmine.ns.cloudflare.com (108.162.192.170), an authoritative server: no cache in between, so these are the live values.

PTR Reverse pointer

1800PTRone.one.one.one.
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 g.root-servers.net 192.112.36.427 ms

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

    • a.in-addr-servers.arpa 199.180.182.53 2620:37:e000::53
    • d.in-addr-servers.arpa 200.10.60.53 2001:13c7:7010::53
    • e.in-addr-servers.arpa 203.119.86.101 2001:dd8:6::101
    • b.in-addr-servers.arpa 199.253.183.183 2001:500:87::87
    • 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 d.in-addr-servers.arpa 200.10.60.53118 ms

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

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

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

  3. 1.in-addr.arpa.asked ns1.apnic.net 203.119.42.53167 ms

    Referral to 0.0.1.in-addr.arpa. unsigned delegation

    • tony.ns.cloudflare.com 108.162.193.240 172.64.33.240 173.245.59.240 2606:4700:58::adf5:3bf0 2803:f800:50::6ca2:c1f0 2a06:98c1:50::ac40:21f0
    • jasmine.ns.cloudflare.com 108.162.192.170 172.64.32.170 173.245.58.170 2606:4700:50::adf5:3aaa 2803:f800:50::6ca2:c0aa 2a06:98c1:50::ac40:20aa

    No glue for tony.ns.cloudflare.com, jasmine.ns.cloudflare.com: addresses looked up via a resolver.

  4. 0.0.1.in-addr.arpa.asked jasmine.ns.cloudflare.com 173.245.58.1709.0 ms

    Answer (authoritative):

    1.0.0.1.in-addr.arpa.1800PTRone.one.one.one.

Nameservers

Every address of every nameserver, asked for 0.0.1.in-addr.arpa's SOA. "Parent" means the 1.in-addr.arpa zone delegates to it; "zone" means 0.0.1.in-addr.arpa lists it itself.

NameserverListed inAddressStatusSerialTime
jasmine.ns.cloudflare.comparent + zone108.162.192.170 glueauthoritative23479195046.4 ms
172.64.32.170 glueauthoritative23479195046.9 ms
173.245.58.170 glueauthoritative23479195046.9 ms
2606:4700:50::adf5:3aaa glueauthoritative23479195049.3 ms
2803:f800:50::6ca2:c0aa glueauthoritative23479195049.3 ms
2a06:98c1:50::ac40:20aa glueauthoritative234791950410 ms
tony.ns.cloudflare.comparent + zone108.162.193.240 glueauthoritative23479195049.3 ms
172.64.33.240 glueauthoritative23479195047.7 ms
173.245.59.240 glueauthoritative23479195049.3 ms
2606:4700:58::adf5:3bf0 glueauthoritative23479195049.5 ms
2803:f800:50::6ca2:c1f0 glueauthoritative23479195049.6 ms
2a06:98c1:50::ac40:21f0 glueauthoritative23479195049.7 ms

DNSSEC

0.0.1.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)
jasmine.ns.cloudflare.com
nameserver
108.162.192.170jasmine.ns.cloudflare.com ✓
172.64.32.170jasmine.ns.cloudflare.com ✓
173.245.58.170jasmine.ns.cloudflare.com ✓
2606:4700:50::adf5:3aaajasmine.ns.cloudflare.com ✓
2803:f800:50::6ca2:c0aajasmine.ns.cloudflare.com ✓
2a06:98c1:50::ac40:20aajasmine.ns.cloudflare.com ✓
tony.ns.cloudflare.com
nameserver
108.162.193.240tony.ns.cloudflare.com ✓
172.64.33.240tony.ns.cloudflare.com ✓
173.245.59.240tony.ns.cloudflare.com ✓
2606:4700:58::adf5:3bf0tony.ns.cloudflare.com ✓
2803:f800:50::6ca2:c1f0tony.ns.cloudflare.com ✓
2a06:98c1:50::ac40:21f0tony.ns.cloudflare.com ✓
one.one.one.one
PTR target
1.1.1.1one.one.one.one ✓
1.0.0.1one.one.one.one ✓
2606:4700:4700::1111one.one.one.one ✓
2606:4700:4700::1001one.one.one.one ✓

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 1.1.1.1one.one.one.one.
TTL 1800
Google 8.8.8.8one.one.one.one.
TTL 957
Quad9 9.9.9.9one.one.one.one.
TTL 437
OpenDNS 208.67.222.222one.one.one.one.
TTL 437

Text dump

; DNS report for 1.0.0.1.in-addr.arpa (1.0.0.1)
; 2026-11-09 05:22:44 UTC, 100 queries in 0.74 s, zone 0.0.1.in-addr.arpa

;; FINDINGS
;  [INFO] 0.0.1.in-addr.arpa isn't signed with DNSSEC, so resolvers can't tell forged answers from real ones.

;; RECORDS (authoritative, from jasmine.ns.cloudflare.com (108.162.192.170))
1.0.0.1.in-addr.arpa.	1800	IN	PTR	one.one.one.one.

;; TRACE
;  1.0.0.1.in-addr.arpa PTR
;  . @g.root-servers.net (192.112.36.4) 27 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	d.in-addr-servers.arpa.	; 200.10.60.53 2001:13c7:7010::53
in-addr.arpa.		NS	e.in-addr-servers.arpa.	; 203.119.86.101 2001:dd8:6::101
in-addr.arpa.		NS	b.in-addr-servers.arpa.	; 199.253.183.183 2001:500:87::87
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	47054 8 2 5CAFCCEC201D1933B4C9F6A9C8F51E51F3B39979058AC21B8DF1B1F281CBC6F2
in-addr.arpa.	86400	IN	DS	63982 8 2 AAF4FB5D213EF25AE44679032EBE3514C487D7ABD99D7F5FEC3383D030733C73
in-addr.arpa.	86400	IN	DS	54956 8 2 E0E2BF5CFBD66572CA05EC18267D91509BA6A9405AF05C3FD4141DFA45200C08
in-addr.arpa.	86400	IN	DS	53696 8 2 13E5501C56B20394DA921B51412D48B7089C5EB6957A7C58553C4D4D424F04DF
;  in-addr.arpa. @d.in-addr-servers.arpa (200.10.60.53) 118 ms [NOERROR qr]: referral to 1.in-addr.arpa.
1.in-addr.arpa.		NS	ns3.lacnic.net.	; 200.3.13.14 2001:13c7:7002:3000::14
1.in-addr.arpa.		NS	ns2.apnic.net.	; 203.119.95.53 2001:ddd::53
1.in-addr.arpa.		NS	rirns.arin.net.	; 199.253.249.53 2620:38:2000::53
1.in-addr.arpa.		NS	apnic.authdns.ripe.net.	; 193.0.9.9 2a13:27c0:30::9
1.in-addr.arpa.		NS	ns1.apnic.net.	; 203.119.42.53 2001:dd8:e::53
1.in-addr.arpa.	86400	IN	DS	43707 13 2 90867C2CAA60E545F8178736BEA481492C81D544FDAE2FFDA0BB17ECC57D3017
;  1.in-addr.arpa. @ns1.apnic.net (203.119.42.53) 167 ms [NOERROR qr]: referral to 0.0.1.in-addr.arpa.
0.0.1.in-addr.arpa.		NS	tony.ns.cloudflare.com.	; 108.162.193.240 172.64.33.240 173.245.59.240 2606:4700:58::adf5:3bf0 2803:f800:50::6ca2:c1f0 2a06:98c1:50::ac40:21f0
0.0.1.in-addr.arpa.		NS	jasmine.ns.cloudflare.com.	; 108.162.192.170 172.64.32.170 173.245.58.170 2606:4700:50::adf5:3aaa 2803:f800:50::6ca2:c0aa 2a06:98c1:50::ac40:20aa
;  0.0.1.in-addr.arpa. @jasmine.ns.cloudflare.com (173.245.58.170) 9.0 ms [NOERROR qr aa]: answer
1.0.0.1.in-addr.arpa.	1800	IN	PTR	one.one.one.one.

;; NAMESERVERS (SOA asked of each address)
;  jasmine.ns.cloudflare.com [parent+zone]
;    108.162.192.170                         ok                        2347919504  6.4 ms
;    172.64.32.170                           ok                        2347919504  6.9 ms
;    173.245.58.170                          ok                        2347919504  6.9 ms
;    2606:4700:50::adf5:3aaa                 ok                        2347919504  9.3 ms
;    2803:f800:50::6ca2:c0aa                 ok                        2347919504  9.3 ms
;    2a06:98c1:50::ac40:20aa                 ok                        2347919504  10 ms
;  tony.ns.cloudflare.com [parent+zone]
;    108.162.193.240                         ok                        2347919504  9.3 ms
;    172.64.33.240                           ok                        2347919504  7.7 ms
;    173.245.59.240                          ok                        2347919504  9.3 ms
;    2606:4700:58::adf5:3bf0                 ok                        2347919504  9.5 ms
;    2803:f800:50::6ca2:c1f0                 ok                        2347919504  9.6 ms
;    2a06:98c1:50::ac40:21f0                 ok                        2347919504  9.7 ms

;; DNSSEC: unsigned

;; HOSTS
;  jasmine.ns.cloudflare.com (nameserver)
;    108.162.192.170                         PTR jasmine.ns.cloudflare.com (confirmed)
;    172.64.32.170                           PTR jasmine.ns.cloudflare.com (confirmed)
;    173.245.58.170                          PTR jasmine.ns.cloudflare.com (confirmed)
;    2606:4700:50::adf5:3aaa                 PTR jasmine.ns.cloudflare.com (confirmed)
;    2803:f800:50::6ca2:c0aa                 PTR jasmine.ns.cloudflare.com (confirmed)
;    2a06:98c1:50::ac40:20aa                 PTR jasmine.ns.cloudflare.com (confirmed)
;  tony.ns.cloudflare.com (nameserver)
;    108.162.193.240                         PTR tony.ns.cloudflare.com (confirmed)
;    172.64.33.240                           PTR tony.ns.cloudflare.com (confirmed)
;    173.245.59.240                          PTR tony.ns.cloudflare.com (confirmed)
;    2606:4700:58::adf5:3bf0                 PTR tony.ns.cloudflare.com (confirmed)
;    2803:f800:50::6ca2:c1f0                 PTR tony.ns.cloudflare.com (confirmed)
;    2a06:98c1:50::ac40:21f0                 PTR tony.ns.cloudflare.com (confirmed)
;  one.one.one.one (PTR target)
;    1.1.1.1                                 PTR one.one.one.one (confirmed)
;    1.0.0.1                                 PTR one.one.one.one (confirmed)
;    2606:4700:4700::1111                    PTR one.one.one.one (confirmed)
;    2606:4700:4700::1001                    PTR one.one.one.one (confirmed)

;; PUBLIC RESOLVERS
;  Cloudflare PTR   one.one.one.one.  ttl 1800
;  Google     PTR   one.one.one.one.  ttl 957
;  Quad9      PTR   one.one.one.one.  ttl 437
;  OpenDNS    PTR   one.one.one.one.  ttl 437