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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.

47.94.104.101

101.104.94.47.in-addr.arpa

Zone 94.47.in-addr.arpa75 queries in 1.6 s2026-11-09 05:55:04 UTCNot DNSSEC-signed

WHOIS for 47.94.104.101 →TextJSON
  • Note All of 94.47.in-addr.arpa's nameservers are in one /24 network (140.205.122.0/24): one outage takes them all down.
  • Note 94.47.in-addr.arpa isn't signed with DNSSEC, so resolvers can't tell forged answers from real ones.

Records

Asked directly of rdns2.alidns.com (140.205.122.243), an authoritative server: no cache in between, so these are the live values.

PTR Reverse pointer

3600PTRdns1.c01.nsone.net.cn.
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 a.root-servers.net 198.41.0.412 ms

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

    • f.in-addr-servers.arpa 193.0.9.1 2a13:27c0:30::1
    • b.in-addr-servers.arpa 199.253.183.183 2001:500:87::87
    • 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
    • e.in-addr-servers.arpa 203.119.86.101 2001:dd8:6::101
  2. in-addr.arpa.asked f.in-addr-servers.arpa 193.0.9.111 ms

    Referral to 47.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. 47.in-addr.arpa.asked arin.authdns.ripe.net 193.0.9.1011 ms

    Referral to 94.47.in-addr.arpa. unsigned delegation

    • rdns2.alidns.com 140.205.122.243 2401:b180:4100::15
    • rdns1.alidns.com 140.205.122.253 2401:b180:4100::14

    No glue for rdns2.alidns.com, rdns1.alidns.com: addresses looked up via a resolver.

    199.180.180.63 failed: NOERROR

  4. 94.47.in-addr.arpa.asked rdns2.alidns.com 140.205.122.2436.5 ms

    Answer (authoritative):

    101.104.94.47.in-addr.arpa.3600PTRdns1.c01.nsone.net.cn.

Nameservers

Every address of every nameserver, asked for 94.47.in-addr.arpa's SOA. "Parent" means the 47.in-addr.arpa zone delegates to it; "zone" means 94.47.in-addr.arpa lists it itself.

NameserverListed inAddressStatusSerialTime
rdns1.alidns.comparent + zone140.205.122.253 glueauthoritative2015011350195 ms
2401:b180:4100::14 glueauthoritative2015011350220 ms
rdns2.alidns.comparent + zone140.205.122.243 glueauthoritative20150113505.9 ms
2401:b180:4100::15 glueauthoritative2015011350197 ms

DNSSEC

94.47.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)
rdns1.alidns.com
nameserver
140.205.122.253none
2401:b180:4100::14none
rdns2.alidns.com
nameserver
140.205.122.243none
2401:b180:4100::15none
dns1.c01.nsone.net.cn
PTR target
47.94.104.101dns1.c01.nsone.net.cn ✓

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 1.1.1.1dns1.c01.nsone.net.cn.
TTL 3600
Google 8.8.8.8dns1.c01.nsone.net.cn.
TTL 3600
Quad9 9.9.9.9dns1.c01.nsone.net.cn.
TTL 3600
OpenDNS 208.67.222.222dns1.c01.nsone.net.cn.
TTL 3600

Text dump

; DNS report for 101.104.94.47.in-addr.arpa (47.94.104.101)
; 2026-11-09 05:55:04 UTC, 75 queries in 1.59 s, zone 94.47.in-addr.arpa

;; FINDINGS
;  [INFO] All of 94.47.in-addr.arpa's nameservers are in one /24 network (140.205.122.0/24): one outage takes them all down.
;  [INFO] 94.47.in-addr.arpa isn't signed with DNSSEC, so resolvers can't tell forged answers from real ones.

;; RECORDS (authoritative, from rdns2.alidns.com (140.205.122.243))
101.104.94.47.in-addr.arpa.	3600	IN	PTR	dns1.c01.nsone.net.cn.

;; TRACE
;  101.104.94.47.in-addr.arpa PTR
;  . @a.root-servers.net (198.41.0.4) 12 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	b.in-addr-servers.arpa.	; 199.253.183.183 2001:500:87::87
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	e.in-addr-servers.arpa.	; 203.119.86.101 2001:dd8:6::101
in-addr.arpa.	86400	IN	DS	63982 8 2 AAF4FB5D213EF25AE44679032EBE3514C487D7ABD99D7F5FEC3383D030733C73
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	47054 8 2 5CAFCCEC201D1933B4C9F6A9C8F51E51F3B39979058AC21B8DF1B1F281CBC6F2
;  in-addr.arpa. @f.in-addr-servers.arpa (193.0.9.1) 11 ms [NOERROR qr]: referral to 47.in-addr.arpa.
47.in-addr.arpa.		NS	r.arin.net.	; 199.180.180.63 2001:500:f0::63
47.in-addr.arpa.		NS	u.arin.net.	; 204.61.216.50 2001:500:14:6050:ad::1
47.in-addr.arpa.		NS	x.arin.net.	; 199.180.180.63 2001:500:f0::63
47.in-addr.arpa.		NS	y.arin.net.	; 192.82.134.30 2001:500:127::30
47.in-addr.arpa.		NS	z.arin.net.	; 199.180.180.63 2001:500:f0::63
47.in-addr.arpa.		NS	arin.authdns.ripe.net.	; 193.0.9.10 2a13:27c0:30::10
47.in-addr.arpa.	86400	IN	DS	37861 8 2 533D485691F3534677AB21A808958035746C823C57EB06AA53FC55D9D641A1FA
;  47.in-addr.arpa. @arin.authdns.ripe.net (193.0.9.10) 11 ms [NOERROR qr]: referral to 94.47.in-addr.arpa.
94.47.in-addr.arpa.		NS	rdns2.alidns.com.	; 140.205.122.243 2401:b180:4100::15
94.47.in-addr.arpa.		NS	rdns1.alidns.com.	; 140.205.122.253 2401:b180:4100::14
;  94.47.in-addr.arpa. @rdns2.alidns.com (140.205.122.243) 6.5 ms [NOERROR qr aa]: answer
101.104.94.47.in-addr.arpa.	3600	IN	PTR	dns1.c01.nsone.net.cn.

;; NAMESERVERS (SOA asked of each address)
;  rdns1.alidns.com [parent+zone]
;    140.205.122.253                         ok                        2015011350  195 ms
;    2401:b180:4100::14                      ok                        2015011350  220 ms
;  rdns2.alidns.com [parent+zone]
;    140.205.122.243                         ok                        2015011350  5.9 ms
;    2401:b180:4100::15                      ok                        2015011350  197 ms

;; DNSSEC: unsigned

;; HOSTS
;  rdns1.alidns.com (nameserver)
;    140.205.122.253                         PTR none
;    2401:b180:4100::14                      PTR none
;  rdns2.alidns.com (nameserver)
;    140.205.122.243                         PTR none
;    2401:b180:4100::15                      PTR none
;  dns1.c01.nsone.net.cn (PTR target)
;    47.94.104.101                           PTR dns1.c01.nsone.net.cn (confirmed)

;; PUBLIC RESOLVERS
;  Cloudflare PTR   dns1.c01.nsone.net.cn.  ttl 3600
;  Google     PTR   dns1.c01.nsone.net.cn.  ttl 3600
;  Quad9      PTR   dns1.c01.nsone.net.cn.  ttl 3600
;  OpenDNS    PTR   dns1.c01.nsone.net.cn.  ttl 3600