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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.

45.54.42.193

193.42.54.45.in-addr.arpa

Zone 42.54.45.in-addr.arpa98 queries in 2.2 s2026-11-09 06:11:29 UTCNot DNSSEC-signed

WHOIS for 45.54.42.193 →TextJSON
  • Problem Resolution of 193.42.54.45.in-addr.arpa stops at 42.54.45.in-addr.arpa: none of its nameservers answered.
  • Problem None of 42.54.45.in-addr.arpa's nameservers gave an authoritative answer, so the zone is effectively offline.
  • Warning dns1.p01.nsone.net (198.51.44.1) answers REFUSED for 42.54.45.in-addr.arpa.
  • Warning dns1.p01.nsone.net (2620:4d:4000:6259:7:1:0:1) answers REFUSED for 42.54.45.in-addr.arpa.
  • Warning dns2.p01.nsone.net (198.51.45.1) answers REFUSED for 42.54.45.in-addr.arpa.
  • Warning dns2.p01.nsone.net (2a00:edc0:6259:7:1::2) answers REFUSED for 42.54.45.in-addr.arpa.
  • Warning dns3.p01.nsone.net (198.51.44.65) answers REFUSED for 42.54.45.in-addr.arpa.
  • Warning dns3.p01.nsone.net (2620:4d:4000:6259:7:1:0:3) answers REFUSED for 42.54.45.in-addr.arpa.
  • Warning dns4.p01.nsone.net (198.51.45.65) answers REFUSED for 42.54.45.in-addr.arpa.
  • Warning dns4.p01.nsone.net (2a00:edc0:6259:7:1::4) answers REFUSED for 42.54.45.in-addr.arpa.
  • Warning ns01.catchpointdns.com (45.54.42.1) answers REFUSED for 42.54.45.in-addr.arpa.
  • Warning ns01.catchpointdns.com (2607:f740:e638::1) answers REFUSED for 42.54.45.in-addr.arpa.
  • Warning ns02.catchpointdns.com (45.54.42.65) answers REFUSED for 42.54.45.in-addr.arpa.
  • Warning ns02.catchpointdns.com (2607:f740:e638:4::1) answers REFUSED for 42.54.45.in-addr.arpa.
  • Warning ns03.catchpointdns.com (45.54.42.129) answers REFUSED for 42.54.45.in-addr.arpa.
  • Warning ns03.catchpointdns.com (2607:f740:e638:8::1) answers REFUSED for 42.54.45.in-addr.arpa.
  • Warning ns04.catchpointdns.com (45.54.42.193) answers REFUSED for 42.54.45.in-addr.arpa.
  • Warning ns04.catchpointdns.com (2607:f740:e638:c::1) answers REFUSED for 42.54.45.in-addr.arpa.
  • Note 42.54.45.in-addr.arpa isn't signed with DNSSEC, so resolvers can't tell forged answers from real ones.

Resolution trace

  1. .asked m.root-servers.net 202.12.27.3315 ms

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

    • f.in-addr-servers.arpa 193.0.9.1 2a13:27c0:30::1
    • d.in-addr-servers.arpa 200.10.60.53 2001:13c7:7010::53
    • a.in-addr-servers.arpa 199.180.182.53 2620:37:e000::53
    • c.in-addr-servers.arpa 196.216.169.10 2001:43f8:110::10
    • 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

    192.33.4.12 failed: NOERROR

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

    Referral to 45.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.

    200.10.60.53 failed: NOERROR

  3. 45.in-addr.arpa.asked r.arin.net 199.180.180.6390 ms

    Referral to 42.54.45.in-addr.arpa. unsigned delegation

    • ns03.catchpointdns.com 45.54.42.129 2607:f740:e638:8::1
    • dns1.p01.nsone.net 198.51.44.1 2620:4d:4000:6259:7:1:0:1
    • dns2.p01.nsone.net 198.51.45.1 2a00:edc0:6259:7:1::2
    • dns3.p01.nsone.net 198.51.44.65 2620:4d:4000:6259:7:1:0:3
    • dns4.p01.nsone.net 198.51.45.65 2a00:edc0:6259:7:1::4
    • ns01.catchpointdns.com 45.54.42.1 2607:f740:e638::1
    • ns02.catchpointdns.com 45.54.42.65 2607:f740:e638:4::1
    • ns04.catchpointdns.com 45.54.42.193 2607:f740:e638:c::1

    No glue for ns03.catchpointdns.com, dns1.p01.nsone.net, dns2.p01.nsone.net, dns3.p01.nsone.net, dns4.p01.nsone.net, ns01.catchpointdns.com, ns02.catchpointdns.com, ns04.catchpointdns.com: addresses looked up via a resolver.

    199.180.180.63 failed: NOERROR

  4. 42.54.45.in-addr.arpa.

    No nameserver of 42.54.45.in-addr.arpa answered.

    45.54.42.129 failed: REFUSED

    198.51.45.1 failed: REFUSED

    45.54.42.1 failed: REFUSED

    198.51.44.1 failed: REFUSED

    45.54.42.193 failed: REFUSED

    45.54.42.65 failed: REFUSED

Nameservers

Every address of every nameserver, asked for 42.54.45.in-addr.arpa's SOA. "Parent" means the 45.in-addr.arpa zone delegates to it; "zone" means 42.54.45.in-addr.arpa lists it itself.

NameserverListed inAddressStatusSerialTime
dns1.p01.nsone.netparent198.51.44.1 glueREFUSED12 ms
2620:4d:4000:6259:7:1:0:1 glueREFUSED14 ms
dns2.p01.nsone.netparent198.51.45.1 glueREFUSED5.7 ms
2a00:edc0:6259:7:1::2 glueREFUSED13 ms
dns3.p01.nsone.netparent198.51.44.65 glueREFUSED14 ms
2620:4d:4000:6259:7:1:0:3 glueREFUSED13 ms
dns4.p01.nsone.netparent198.51.45.65 glueREFUSED5.6 ms
2a00:edc0:6259:7:1::4 glueREFUSED13 ms
ns01.catchpointdns.comparent45.54.42.1 glueREFUSED16 ms
2607:f740:e638::1 glueREFUSED19 ms
ns02.catchpointdns.comparent45.54.42.65 glueREFUSED16 ms
2607:f740:e638:4::1 glueREFUSED19 ms
ns03.catchpointdns.comparent45.54.42.129 glueREFUSED16 ms
2607:f740:e638:8::1 glueREFUSED19 ms
ns04.catchpointdns.comparent45.54.42.193 glueREFUSED16 ms
2607:f740:e638:c::1 glueREFUSED18 ms

DNSSEC

42.54.45.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)
dns1.p01.nsone.net
nameserver
198.51.44.1dns1.p01.nsone.net ✓
2620:4d:4000:6259:7:1:0:1dns1.p01.nsone.net ✓
dns2.p01.nsone.net
nameserver
198.51.45.1dns2.p01.nsone.net ✓
2a00:edc0:6259:7:1::2dns2.p01.nsone.net ✓
dns3.p01.nsone.net
nameserver
198.51.44.65dns3.p01.nsone.net ✓
2620:4d:4000:6259:7:1:0:3dns3.p01.nsone.net ✓
dns4.p01.nsone.net
nameserver
198.51.45.65dns4.p01.nsone.net ✓
2a00:edc0:6259:7:1::4dns4.p01.nsone.net ✓
ns01.catchpointdns.com
nameserver
45.54.42.1none
2607:f740:e638::1none
ns02.catchpointdns.com
nameserver
45.54.42.65none
2607:f740:e638:4::1none
ns03.catchpointdns.com
nameserver
45.54.42.129none
2607:f740:e638:8::1none
ns04.catchpointdns.com
nameserver
45.54.42.193none
2607:f740:e638:c::1none

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 1.1.1.1SERVFAIL
Google 8.8.8.8SERVFAIL
Quad9 9.9.9.9timed out
OpenDNS 208.67.222.222SERVFAIL

Text dump

; DNS report for 193.42.54.45.in-addr.arpa (45.54.42.193)
; 2026-11-09 06:11:29 UTC, 98 queries in 2.25 s, zone 42.54.45.in-addr.arpa

;; FINDINGS
;  [ERROR] Resolution of 193.42.54.45.in-addr.arpa stops at 42.54.45.in-addr.arpa: none of its nameservers answered.
;  [ERROR] None of 42.54.45.in-addr.arpa's nameservers gave an authoritative answer, so the zone is effectively offline.
;  [WARN] dns1.p01.nsone.net (198.51.44.1) answers REFUSED for 42.54.45.in-addr.arpa.
;  [WARN] dns1.p01.nsone.net (2620:4d:4000:6259:7:1:0:1) answers REFUSED for 42.54.45.in-addr.arpa.
;  [WARN] dns2.p01.nsone.net (198.51.45.1) answers REFUSED for 42.54.45.in-addr.arpa.
;  [WARN] dns2.p01.nsone.net (2a00:edc0:6259:7:1::2) answers REFUSED for 42.54.45.in-addr.arpa.
;  [WARN] dns3.p01.nsone.net (198.51.44.65) answers REFUSED for 42.54.45.in-addr.arpa.
;  [WARN] dns3.p01.nsone.net (2620:4d:4000:6259:7:1:0:3) answers REFUSED for 42.54.45.in-addr.arpa.
;  [WARN] dns4.p01.nsone.net (198.51.45.65) answers REFUSED for 42.54.45.in-addr.arpa.
;  [WARN] dns4.p01.nsone.net (2a00:edc0:6259:7:1::4) answers REFUSED for 42.54.45.in-addr.arpa.
;  [WARN] ns01.catchpointdns.com (45.54.42.1) answers REFUSED for 42.54.45.in-addr.arpa.
;  [WARN] ns01.catchpointdns.com (2607:f740:e638::1) answers REFUSED for 42.54.45.in-addr.arpa.
;  [WARN] ns02.catchpointdns.com (45.54.42.65) answers REFUSED for 42.54.45.in-addr.arpa.
;  [WARN] ns02.catchpointdns.com (2607:f740:e638:4::1) answers REFUSED for 42.54.45.in-addr.arpa.
;  [WARN] ns03.catchpointdns.com (45.54.42.129) answers REFUSED for 42.54.45.in-addr.arpa.
;  [WARN] ns03.catchpointdns.com (2607:f740:e638:8::1) answers REFUSED for 42.54.45.in-addr.arpa.
;  [WARN] ns04.catchpointdns.com (45.54.42.193) answers REFUSED for 42.54.45.in-addr.arpa.
;  [WARN] ns04.catchpointdns.com (2607:f740:e638:c::1) answers REFUSED for 42.54.45.in-addr.arpa.
;  [INFO] 42.54.45.in-addr.arpa isn't signed with DNSSEC, so resolvers can't tell forged answers from real ones.

;; TRACE
;  193.42.54.45.in-addr.arpa PTR
;  . @m.root-servers.net (202.12.27.33) 15 ms [NOERROR qr]: referral to in-addr.arpa.
in-addr.arpa.		NS	f.in-addr-servers.arpa.	; 193.0.9.1 2a13:27c0:30::1
in-addr.arpa.		NS	d.in-addr-servers.arpa.	; 200.10.60.53 2001:13c7:7010::53
in-addr.arpa.		NS	a.in-addr-servers.arpa.	; 199.180.182.53 2620:37:e000::53
in-addr.arpa.		NS	c.in-addr-servers.arpa.	; 196.216.169.10 2001:43f8:110::10
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.	86400	IN	DS	53696 8 2 13E5501C56B20394DA921B51412D48B7089C5EB6957A7C58553C4D4D424F04DF
in-addr.arpa.	86400	IN	DS	54956 8 2 E0E2BF5CFBD66572CA05EC18267D91509BA6A9405AF05C3FD4141DFA45200C08
in-addr.arpa.	86400	IN	DS	63982 8 2 AAF4FB5D213EF25AE44679032EBE3514C487D7ABD99D7F5FEC3383D030733C73
in-addr.arpa.	86400	IN	DS	47054 8 2 5CAFCCEC201D1933B4C9F6A9C8F51E51F3B39979058AC21B8DF1B1F281CBC6F2
;  in-addr.arpa. @f.in-addr-servers.arpa (193.0.9.1) 11 ms [NOERROR qr]: referral to 45.in-addr.arpa.
45.in-addr.arpa.		NS	r.arin.net.	; 199.180.180.63 2001:500:f0::63
45.in-addr.arpa.		NS	u.arin.net.	; 204.61.216.50 2001:500:14:6050:ad::1
45.in-addr.arpa.		NS	x.arin.net.	; 199.180.180.63 2001:500:f0::63
45.in-addr.arpa.		NS	y.arin.net.	; 192.82.134.30 2001:500:127::30
45.in-addr.arpa.		NS	z.arin.net.	; 199.180.180.63 2001:500:f0::63
45.in-addr.arpa.		NS	arin.authdns.ripe.net.	; 193.0.9.10 2a13:27c0:30::10
45.in-addr.arpa.	86400	IN	DS	9136 8 2 97414863B7A0FDE713FB174990E9B43DE47467707010C01380743425EE6D146B
;  45.in-addr.arpa. @r.arin.net (199.180.180.63) 90 ms [NOERROR qr]: referral to 42.54.45.in-addr.arpa.
42.54.45.in-addr.arpa.		NS	ns03.catchpointdns.com.	; 45.54.42.129 2607:f740:e638:8::1
42.54.45.in-addr.arpa.		NS	dns1.p01.nsone.net.	; 198.51.44.1 2620:4d:4000:6259:7:1:0:1
42.54.45.in-addr.arpa.		NS	dns2.p01.nsone.net.	; 198.51.45.1 2a00:edc0:6259:7:1::2
42.54.45.in-addr.arpa.		NS	dns3.p01.nsone.net.	; 198.51.44.65 2620:4d:4000:6259:7:1:0:3
42.54.45.in-addr.arpa.		NS	dns4.p01.nsone.net.	; 198.51.45.65 2a00:edc0:6259:7:1::4
42.54.45.in-addr.arpa.		NS	ns01.catchpointdns.com.	; 45.54.42.1 2607:f740:e638::1
42.54.45.in-addr.arpa.		NS	ns02.catchpointdns.com.	; 45.54.42.65 2607:f740:e638:4::1
42.54.45.in-addr.arpa.		NS	ns04.catchpointdns.com.	; 45.54.42.193 2607:f740:e638:c::1
;  42.54.45.in-addr.arpa.: failed: No nameserver of 42.54.45.in-addr.arpa answered.

;; NAMESERVERS (SOA asked of each address)
;  dns1.p01.nsone.net [parent]
;    198.51.44.1                             REFUSED                               12 ms
;    2620:4d:4000:6259:7:1:0:1               REFUSED                               14 ms
;  dns2.p01.nsone.net [parent]
;    198.51.45.1                             REFUSED                               5.7 ms
;    2a00:edc0:6259:7:1::2                   REFUSED                               13 ms
;  dns3.p01.nsone.net [parent]
;    198.51.44.65                            REFUSED                               14 ms
;    2620:4d:4000:6259:7:1:0:3               REFUSED                               13 ms
;  dns4.p01.nsone.net [parent]
;    198.51.45.65                            REFUSED                               5.6 ms
;    2a00:edc0:6259:7:1::4                   REFUSED                               13 ms
;  ns01.catchpointdns.com [parent]
;    45.54.42.1                              REFUSED                               16 ms
;    2607:f740:e638::1                       REFUSED                               19 ms
;  ns02.catchpointdns.com [parent]
;    45.54.42.65                             REFUSED                               16 ms
;    2607:f740:e638:4::1                     REFUSED                               19 ms
;  ns03.catchpointdns.com [parent]
;    45.54.42.129                            REFUSED                               16 ms
;    2607:f740:e638:8::1                     REFUSED                               19 ms
;  ns04.catchpointdns.com [parent]
;    45.54.42.193                            REFUSED                               16 ms
;    2607:f740:e638:c::1                     REFUSED                               18 ms

;; DNSSEC: unsigned

;; HOSTS
;  dns1.p01.nsone.net (nameserver)
;    198.51.44.1                             PTR dns1.p01.nsone.net (confirmed)
;    2620:4d:4000:6259:7:1:0:1               PTR dns1.p01.nsone.net (confirmed)
;  dns2.p01.nsone.net (nameserver)
;    198.51.45.1                             PTR dns2.p01.nsone.net (confirmed)
;    2a00:edc0:6259:7:1::2                   PTR dns2.p01.nsone.net (confirmed)
;  dns3.p01.nsone.net (nameserver)
;    198.51.44.65                            PTR dns3.p01.nsone.net (confirmed)
;    2620:4d:4000:6259:7:1:0:3               PTR dns3.p01.nsone.net (confirmed)
;  dns4.p01.nsone.net (nameserver)
;    198.51.45.65                            PTR dns4.p01.nsone.net (confirmed)
;    2a00:edc0:6259:7:1::4                   PTR dns4.p01.nsone.net (confirmed)
;  ns01.catchpointdns.com (nameserver)
;    45.54.42.1                              PTR none
;    2607:f740:e638::1                       PTR none
;  ns02.catchpointdns.com (nameserver)
;    45.54.42.65                             PTR none
;    2607:f740:e638:4::1                     PTR none
;  ns03.catchpointdns.com (nameserver)
;    45.54.42.129                            PTR none
;    2607:f740:e638:8::1                     PTR none
;  ns04.catchpointdns.com (nameserver)
;    45.54.42.193                            PTR none
;    2607:f740:e638:c::1                     PTR none

;; PUBLIC RESOLVERS
;  Cloudflare PTR   SERVFAIL
;  Google     PTR   SERVFAIL
;  Quad9      PTR   timed out
;  OpenDNS    PTR   SERVFAIL