Domain report: tb.53kf.com

Registration

info

.com generic · Chengdu West Dimension Digital Technology Co., Ltd. · expires 2030-11-07

Found

TLD: .com (generic)
ICANN policies apply: yes
Registrar: Chengdu West Dimension Digital Technology Co., Ltd.
Registered: 7 November 2005
Last changed: 10 October 2025
Expires: 7 November 2030
Status: active
Registry nameservers: vip3.alidns.com, vip4.alidns.com
RDAP server: https://rdap.verisign.com/com/v1/

Checks

i

.com is a generic TLD (gTLD)

Generic TLD under an ICANN registry agreement: ICANN-accredited registrars, UDRP and RDAP apply.

#1
✓ TLD delegated and signed #2

.com is delegated in the root zone and DNSSEC-signed.
✓ Expires on 2030-11-07 #3

The registration is valid until 2030-11-07 (1476 days).
i

No transfer lock

The domain has no transfer lock (status: active). A registrar lock protects against unauthorized transfers.

#4
✓ Registry and delegation match #5

The nameservers registered at the registry are the ones published in DNS.

Delegation

warn

vip3.alidns.com, vip4.alidns.com

Found

Parent zone: com
Delegation from: a.gtld-servers.net (192.5.6.30)
NS at the parent: vip3.alidns.com, vip4.alidns.com
NS in the zone: vip3.alidns.com, vip4.alidns.com

Nameserver	Addresses	Network (AS)	Glue
vip3.alidns.com	140.205.1.5 170.33.32.210 170.33.73.26 170.33.80.10 8.212.93.3 2408:4009:500::3	AS45102 ALIBABA-CN-NET - Alibaba (US) Technology Co., Ltd., CN AS134963 ASEPL-AS-AP - Alibaba Cloud (Singapore) Private Limited, SG AS45102 ALIBABA-CN-NET - Alibaba (US) Technology Co., Ltd., CN AS45102 ALIBABA-CN-NET - Alibaba (US) Technology Co., Ltd., CN AS134963 ASEPL-AS-AP - Alibaba Cloud (Singapore) Private Limited, SG AS45102 ALIBABA-CN-NET - Alibaba (US) Technology Co., Ltd., CN	121.40.6.163 140.205.1.5 170.33.32.210 170.33.73.26 170.33.80.10 2408:4009:500::3 39.103.26.212 47.108.36.163 47.116.84.178 8.129.152.245 8.212.93.3
vip4.alidns.com	170.33.32.211 170.33.80.11 140.205.1.6 8.212.93.4 170.33.73.27 2408:4009:500::4	AS45102 ALIBABA-CN-NET - Alibaba (US) Technology Co., Ltd., CN AS45102 ALIBABA-CN-NET - Alibaba (US) Technology Co., Ltd., CN AS45102 ALIBABA-CN-NET - Alibaba (US) Technology Co., Ltd., CN AS45102 ALIBABA-CN-NET - Alibaba (US) Technology Co., Ltd., CN AS45102 ALIBABA-CN-NET - Alibaba (US) Technology Co., Ltd., CN AS45102 ALIBABA-CN-NET - Alibaba (US) Technology Co., Ltd., CN	121.40.6.164 140.205.1.6 170.33.32.211 170.33.73.27 170.33.80.11 2408:4009:500::4 39.103.26.213 47.108.36.164 47.116.84.179 8.129.152.246 8.212.93.4

Checks

i

2 nameservers

Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: vip3.alidns.com, vip4.alidns.com.

#6
✓ Parent and zone agree #7

The parent delegation and the zone's NS records list the same nameservers.
!

Glue differs from the zone

The addresses at the parent (glue) differ from the addresses in the zone: vip3.alidns.com (glue 121.40.6.163, 140.205.1.5, 170.33.32.210, 170.33.73.26, 170.33.80.10, 2408:4009:500::3, 39.103.26.212, 47.108.36.163, 47.116.84.178, 8.129.152.245, 8.212.93.3, zone 140.205.1.5, 170.33.32.210, 170.33.73.26, 170.33.80.10, 8.212.93.3, 2408:4009:500::3); vip4.alidns.com (glue 121.40.6.164, 140.205.1.6, 170.33.32.211, 170.33.73.27, 170.33.80.11, 2408:4009:500::4, 39.103.26.213, 47.108.36.164, 47.116.84.179, 8.129.152.246, 8.212.93.4, zone 170.33.32.211, 170.33.80.11, 140.205.1.6, 8.212.93.4, 170.33.73.27, 2408:4009:500::4). Update the glue at your registrar.

#8
✓ All names resolve #9

Every nameserver name has an address and is not an alias.
i

One address family in one network

all IPv6 addresses are in 2408:4009:500::/48, while the other address family is spread over several networks.

#10
✓ 2 autonomous systems #11

The nameservers are spread over: AS134963 (ASEPL-AS-AP - Alibaba Cloud (Singapore) Private Limited, SG): 2 addresses; AS45102 (ALIBABA-CN-NET - Alibaba (US) Technology Co., Ltd., CN): 10 addresses.
i

All nameserver names under .com

All nameserver names are under one TLD, so a problem with that TLD also makes the nameservers unreachable. Some operators use names under two TLDs for extra resilience.

#12
✓ All reachable over IPv6 #13

Every nameserver has an IPv6 address.

Nameservers

pass

12 of 12 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
vip3.alidns.com 140.205.1.5	NOERROR, 4 ms, authoritative	no	yes / yes	refused	-
vip3.alidns.com 170.33.32.210	NOERROR, 4 ms, authoritative	no	yes / yes	refused	-
vip3.alidns.com 170.33.73.26	NOERROR, 158 ms, authoritative	no	yes / yes	refused	-
vip3.alidns.com 170.33.80.10	NOERROR, 260 ms, authoritative	no	yes / yes	refused	-
vip3.alidns.com 8.212.93.3	NOERROR, 196 ms, authoritative	no	yes / yes	refused	-
vip3.alidns.com 2408:4009:500::3	NOERROR, 4 ms, authoritative	no	yes / yes	refused	-
vip4.alidns.com 170.33.32.211	NOERROR, 4 ms, authoritative	no	yes / yes	refused	-
vip4.alidns.com 170.33.80.11	NOERROR, 263 ms, authoritative	no	yes / yes	refused	-
vip4.alidns.com 140.205.1.6	NOERROR, 5 ms, authoritative	no	yes / yes	refused	-
vip4.alidns.com 8.212.93.4	NOERROR, 168 ms, authoritative	no	yes / yes	refused	-
vip4.alidns.com 170.33.73.27	NOERROR, 155 ms, authoritative	no	yes / yes	refused	-
vip4.alidns.com 2408:4009:500::4	NOERROR, 4 ms, authoritative	no	yes / yes	refused	-

Checks

✓ All respond #14

All 12 nameserver addresses answered.
✓ All authoritative #15

Every responding nameserver answers authoritatively for the zone.
✓ No recursion #16

The nameservers do not answer recursive queries for other domains.
✓ No version disclosed #17

The nameservers don't reveal their software version.
✓ Zone transfers refused #18

No nameserver allows a zone transfer to the public.
✓ TCP supported #19

All nameservers answer over TCP.
✓ EDNS supported #20

All nameservers support EDNS(0).
✓ Public addresses #21

All nameserver addresses are publicly routable.

SOA

warn

serial 2026081810 · primary vip3.alidns.com

Found

Primary (MNAME): vip3.alidns.com
Contact (RNAME): hostmaster.hichina.com
Serial: 2026081810
Refresh / retry: 3600 s / 1200 s
Expire: 86400 s
Negative TTL: 600 s

Serial per nameserver

Nameserver	Serial
vip3.alidns.com (140.205.1.5)	2026081810
vip3.alidns.com (170.33.32.210)	2026081716
vip3.alidns.com (170.33.73.26)	2026081716
vip3.alidns.com (170.33.80.10)	2026082516
vip3.alidns.com (8.212.93.3)	2018121115
vip3.alidns.com (2408:4009:500::3)	2026082415
vip4.alidns.com (170.33.32.211)	2026081810
vip4.alidns.com (170.33.80.11)	2026081716
vip4.alidns.com (140.205.1.6)	2026081810
vip4.alidns.com (8.212.93.4)	2018121115
vip4.alidns.com (170.33.73.27)	2018121115
vip4.alidns.com (2408:4009:500::4)	2026082415

Checks

!

Serials differ

The nameservers serve different versions of the zone: 2018121115 on vip3.alidns.com (8.212.93.3), vip4.alidns.com (8.212.93.4), vip4.alidns.com (170.33.73.27); 2026081716 on vip3.alidns.com (170.33.32.210), vip3.alidns.com (170.33.73.26), vip4.alidns.com (170.33.80.11); 2026081810 on vip3.alidns.com (140.205.1.5), vip4.alidns.com (170.33.32.211), vip4.alidns.com (140.205.1.6); 2026082415 on vip3.alidns.com (2408:4009:500::3), vip4.alidns.com (2408:4009:500::4); 2026082516 on vip3.alidns.com (170.33.80.10). This is normal for a few minutes after a change; if it lasts, zone transfers to the secondaries are failing.

#22
!

Unusual SOA timers

expire 1d is shorter than 7d; secondaries stop answering too soon when the primary is down. Current values: refresh 1h, retry 20m, expire 1d, negative TTL 10m.

#23
✓ Primary is a public nameserver #24

The primary nameserver vip3.alidns.com is one of the listed nameservers.
✓ Contact hostmaster@hichina.com #25

The SOA RNAME hostmaster.hichina.com means hostmaster@hichina.com.
✓ Date-based serial #26

The serial 2026081810 follows the YYYYMMDDnn convention (2026-08-18).

DNSSEC

pass

Signed, DS published at parent

Found

Validated by resolver: yes
Signatures valid until: 23 October 2026

DS at the parent

Key tag	Algorithm	Digest	Matches a key
54931	ECDSAP256SHA256 (13)	SHA256 926F0BE7C07259CD…	yes

DNSKEY in the zone

Key tag	Role	Algorithm
54931	KSK (257)	ECDSAP256SHA256 (13)
56113	ZSK (256)	ECDSAP256SHA256 (13)

Checks

✓ Signed and validated #27

The zone is signed, the parent publishes a DS record, and the resolver validates the answers.
✓ DS matches a key #28

The DS record at the parent matches a key in the zone: key tag 54931 (SHA256).
✓ Modern algorithms #29

Key algorithms: ECDSAP256SHA256 (13).
✓ Short-lived signatures (online signing) #30

Signatures are valid for 50h0m0s and created on demand; the current one was made at 2026-10-21 09:55 UTC and expires at 2026-10-23 11:55 UTC.

Records

warn

8 records at the apex

Found

Read from: 140.205.1.5:53

Type	Value	TTL
SOA	vip3.alidns.com. hostmaster.hichina.com. 2018121115 3600 1200 86400 600	600
NS	vip4.alidns.com.	86400
NS	vip3.alidns.com.	86400
A	101.66.249.208	60
MX	10 mx.mail.ym.163.com.	60
TXT	"google-site-verification=f5ipYvsH1pxeZlkkpp_L6M2L4IjSDjM7CeCAVMODx3g"	10
TXT	"google-site-verification=WlNeTPTNr9JO4063f44R-UotDDdSwmr4Un4U1aK3Zus"	10
TXT	"v=spf1 include:spf.163.com include:easeye-edm.com ~all"	10

Checks

!

Very low TTLs

These records have a TTL below 5m, causing extra queries and slower lookups: A (1m), MX (1m). Low TTLs are useful just before a planned change. The NS TTL at the parent is 2d and in the zone 1d; resolvers may use either.

#32
✓ No CNAME at the apex #33

The zone apex has no CNAME record.
i

Wildcard record

A random name under the zone resolves, so there is a wildcard (*) record. Typos and non-existent hosts resolve too, which can confuse mail and certificate checks.

#34
i

No CAA records

Without CAA records any certificate authority may issue certificates for this domain. A CAA record limits issuance to the CAs you use.

#35