Domain report: zysycp.com

Registration

info

.com generic · Alibaba Cloud Computing (Beijing) Co., Ltd. · expires 2027-07-23

Found

TLD: .com (generic)
ICANN policies apply: yes
Registrar: Alibaba Cloud Computing (Beijing) Co., Ltd.
Registered: 23 July 2018
Last changed: 21 July 2026
Expires: 23 July 2027
Status: active
Registry nameservers: dns27.hichina.com, dns28.hichina.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 2027-07-23 #3

The registration is valid until 2027-07-23 (273 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

info

dns27.hichina.com, dns28.hichina.com

Found

Parent zone: com
Delegation from: a.gtld-servers.net (192.5.6.30)
NS at the parent: dns27.hichina.com, dns28.hichina.com
NS in the zone: dns27.hichina.com, dns28.hichina.com

Nameserver	Addresses	Network (AS)	Glue
dns27.hichina.com	139.224.142.109 139.224.142.99 39.96.153.59 47.118.199.199 120.76.107.59 39.96.153.39 47.118.199.219 120.76.107.39 2408:4009:501::35	AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN	120.76.107.39 120.76.107.59 139.224.142.109 139.224.142.99 2408:4009:501::35 39.96.153.39 39.96.153.59 47.118.199.199 47.118.199.219
dns28.hichina.com	39.96.153.37 47.118.199.221 120.76.107.37 39.96.153.62 120.76.107.62 139.224.142.107 139.224.142.102 47.118.199.197 2408:4009:501::36	AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN	120.76.107.37 120.76.107.62 139.224.142.102 139.224.142.107 2408:4009:501::36 39.96.153.37 39.96.153.62 47.118.199.197 47.118.199.221

Checks

i

2 nameservers

Two nameservers meet the minimum; RFC 2182 recommends three or more for important zones: dns27.hichina.com, dns28.hichina.com.

#6
✓ Parent and zone agree #7

The parent delegation and the zone's NS records list the same nameservers.
✓ No glue needed #8

All nameservers are outside the zone, so no glue records are needed.
✓ 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 2408:4009:501::/48, while the other address family is spread over several networks.

#10
i

All nameservers in one AS

All nameserver addresses are announced by one network operator (AS37963 (ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN): 18 addresses). An outage or attack on that network affects all nameservers; large anycast providers mitigate this, but a secondary DNS provider adds independence.

#11
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

fail

17 of 18 addresses answer authoritatively

Found

Nameserver	Answer	Recursion	TCP / EDNS	AXFR	Version
dns27.hichina.com 139.224.142.109	NOERROR, 173 ms, authoritative	no	yes / yes	refused	-
dns27.hichina.com 139.224.142.99	NOERROR, 195 ms, authoritative	no	yes / yes	refused	-
dns27.hichina.com 39.96.153.59	NOERROR, 140 ms, authoritative	no	yes / yes	refused	-
dns27.hichina.com 47.118.199.199	NOERROR, 191 ms, authoritative	no	yes / yes	refused	-
dns27.hichina.com 120.76.107.59	NOERROR, 205 ms, authoritative	no	yes / yes	refused	-
dns27.hichina.com 39.96.153.39	NOERROR, 140 ms, authoritative	no	yes / yes	refused	-
dns27.hichina.com 47.118.199.219	NOERROR, 210 ms, authoritative	no	yes / yes	refused	-
dns27.hichina.com 120.76.107.39	NOERROR, 207 ms, authoritative	no	yes / yes	refused	-
dns27.hichina.com 2408:4009:501::35	NOERROR, 201 ms, authoritative	no	yes / yes	refused	-
dns28.hichina.com 39.96.153.37	NOERROR, 153 ms, authoritative	no	yes / yes	refused	-
dns28.hichina.com 47.118.199.221	NOERROR, 206 ms, authoritative	no	yes / yes	refused	-
dns28.hichina.com 120.76.107.37	NOERROR, 214 ms, authoritative	no	yes / yes	refused	-
dns28.hichina.com 39.96.153.62	NOERROR, 147 ms, authoritative	no	yes / yes	refused	-
dns28.hichina.com 120.76.107.62	NOERROR, 206 ms, authoritative	no	yes / yes	refused	-
dns28.hichina.com 139.224.142.107	NOERROR, 202 ms, authoritative	no	yes / yes	refused	-
dns28.hichina.com 139.224.142.102	NOERROR, 181 ms, authoritative	no	yes / yes	refused	-
dns28.hichina.com 47.118.199.197	NOERROR, 205 ms, authoritative	no	yes / yes	refused	-
dns28.hichina.com 2408:4009:501::36	no response	no	no / no	-	-

Checks

✗

Nameservers not responding

These addresses did not answer, so resolvers waste time on timeouts: dns28.hichina.com (2408:4009:501::36): read udp [2a01:4f8:1c1c:eebf::1]:36141->[2408:4009:501::36]:53: i/o timeout.

#14
✓ 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 2018072310 · primary dns27.hichina.com

Found

Primary (MNAME): dns27.hichina.com
Contact (RNAME): hostmaster.hichina.com
Serial: 2018072310
Refresh / retry: 3600 s / 1200 s
Expire: 86400 s
Negative TTL: 600 s

Serial per nameserver

Nameserver	Serial
dns27.hichina.com (139.224.142.109)	2018072310
dns27.hichina.com (139.224.142.99)	2026082616
dns27.hichina.com (39.96.153.59)	2026082617
dns27.hichina.com (47.118.199.199)	2026082815
dns27.hichina.com (120.76.107.59)	2026082509
dns27.hichina.com (39.96.153.39)	2026082616
dns27.hichina.com (47.118.199.219)	2026082616
dns27.hichina.com (120.76.107.39)	2026081813
dns27.hichina.com (2408:4009:501::35)	2026082617
dns28.hichina.com (39.96.153.37)	2026082616
dns28.hichina.com (47.118.199.221)	2026082616
dns28.hichina.com (120.76.107.37)	2026082616
dns28.hichina.com (39.96.153.62)	2026082616
dns28.hichina.com (120.76.107.62)	2026082509
dns28.hichina.com (139.224.142.107)	2026082616
dns28.hichina.com (139.224.142.102)	2026082509
dns28.hichina.com (47.118.199.197)	2026082616

Checks

!

Serials differ

The nameservers serve different versions of the zone: 2018072310 on dns27.hichina.com (139.224.142.109); 2026081813 on dns27.hichina.com (120.76.107.39); 2026082509 on dns27.hichina.com (120.76.107.59), dns28.hichina.com (120.76.107.62), dns28.hichina.com (139.224.142.102); 2026082616 on dns27.hichina.com (139.224.142.99), dns27.hichina.com (39.96.153.39), dns27.hichina.com (47.118.199.219), dns28.hichina.com (39.96.153.37), dns28.hichina.com (47.118.199.221), dns28.hichina.com (120.76.107.37), dns28.hichina.com (39.96.153.62), dns28.hichina.com (139.224.142.107), dns28.hichina.com (47.118.199.197); 2026082617 on dns27.hichina.com (39.96.153.59), dns27.hichina.com (2408:4009:501::35); 2026082815 on dns27.hichina.com (47.118.199.199). 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 dns27.hichina.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 2018072310 follows the YYYYMMDDnn convention (2018-07-23).

DNSSEC

warn

Not signed

Found

Validated by resolver: no

Checks

!

Not signed

The zone is not signed with DNSSEC, so answers can be spoofed. Enable DNSSEC at your DNS provider and publish the DS record at your registrar.

#27

Records

fail

3 records at the apex

Found

Read from: 139.224.142.109:53

Type	Value	TTL
SOA	dns27.hichina.com. hostmaster.hichina.com. 2018072310 3600 1200 86400 600	600
NS	dns27.hichina.com.	86400
NS	dns28.hichina.com.	86400

Checks

✓ TTLs within range #32

TTLs: NS 1d. The NS TTL at the parent is 2d and in the zone 1d; resolvers may use either.
✗

CNAME at the apex

The zone apex is a CNAME to www.51gaokao.org. A CNAME can't coexist with the SOA and NS records (RFC 1034); use your provider's ALIAS/flattening feature instead.

#33
✓ No wildcard #34

Names that don't exist return NXDOMAIN.
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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