youku.com

Checked 22 October 2026, 11:41 UTC · via 8.8.8.8
!Passed with warnings
26 passed 2 warnings 0 failed 3 info

Registration

info

.com generic · Alibaba Cloud Computing (Beijing) Co., Ltd. · expires 2027-12-22

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Alibaba Cloud Computing (Beijing) Co., Ltd.
Registered
22 December 2003
Last changed
8 October 2026
Expires
22 December 2027
Status
client transfer prohibited, server delete prohibited, server transfer prohibited, server update prohibited
Registry nameservers
dns1.youku.com, dns2.youku.com, dns3.youku.com, dns4.youku.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 2027-12-22 #3
    The registration is valid until 2027-12-22 (425 days).
  • ✓ Transfer locked #4
    Registry status: client transfer prohibited, server delete prohibited, server transfer prohibited, server update prohibited.
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

info

dns1.youku.com, dns2.youku.com, dns3.youku.com, dns4.youku.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
dns1.youku.com, dns2.youku.com, dns3.youku.com, dns4.youku.com
NS in the zone
dns1.youku.com, dns2.youku.com, dns3.youku.com, dns4.youku.com
NameserverAddressesNetwork (AS)Glue
dns1.youku.com140.205.103.193 2401:b180:4100::3AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN AS45102 ALIBABA-CN-NET - Alibaba (US) Technology Co., Ltd., CN140.205.103.193 2401:b180:4100::3
dns2.youku.com106.11.41.145 106.11.35.17 2401:b180:4100::8AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN AS45102 ALIBABA-CN-NET - Alibaba (US) Technology Co., Ltd., CN106.11.35.17 106.11.41.145 2401:b180:4100::8
dns3.youku.com47.241.207.17 47.88.74.37 2401:b180:4100::9AS45102 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., CN2401:b180:4100::9 47.241.207.17 47.88.74.37
dns4.youku.com140.205.122.88 2401:b180:4100::10AS37963 ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN AS45102 ALIBABA-CN-NET - Alibaba (US) Technology Co., Ltd., CN140.205.122.88 2401:b180:4100::10

Checks

  • ✓ 4 nameservers #6
    Delegated to dns1.youku.com, dns2.youku.com, dns3.youku.com, dns4.youku.com.
  • ✓ Parent and zone agree #7
    The parent delegation and the zone's NS records list the same nameservers.
  • ✓ Glue present and correct #8
    Glue is published for the nameservers inside the zone: dns1.youku.com, dns2.youku.com, dns3.youku.com, dns4.youku.com.
  • ✓ 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 2401:b180:4100::/48, while the other address family is spread over several networks.
    #10
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS37963 (ALIBABA-CN-NET - Hangzhou Alibaba Advertising Co.,Ltd., CN): 4 addresses; AS45102 (ALIBABA-CN-NET - Alibaba (US) Technology Co., Ltd., CN): 6 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

10 of 10 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
dns1.youku.com 140.205.103.193NOERROR, 170 ms, authoritativenoyes / yesrefused-
dns1.youku.com 2401:b180:4100::3NOERROR, 204 ms, authoritativenoyes / yesrefused-
dns2.youku.com 106.11.41.145NOERROR, 215 ms, authoritativenoyes / yesrefused-
dns2.youku.com 106.11.35.17NOERROR, 153 ms, authoritativenoyes / yesrefused-
dns2.youku.com 2401:b180:4100::8NOERROR, 188 ms, authoritativenoyes / yesrefused-
dns3.youku.com 47.241.207.17NOERROR, 175 ms, authoritativenoyes / yesrefused-
dns3.youku.com 47.88.74.37NOERROR, 157 ms, authoritativenoyes / yesrefused-
dns3.youku.com 2401:b180:4100::9NOERROR, 192 ms, authoritativenoyes / yesrefused-
dns4.youku.com 140.205.122.88NOERROR, 4 ms, authoritativenoyes / yesrefused-
dns4.youku.com 2401:b180:4100::10NOERROR, 196 ms, authoritativenoyes / yesrefused-

Checks

  • ✓ All respond #14
    All 10 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 2017041914 · primary dns1.youku.com

Found

Primary (MNAME)
dns1.youku.com
Contact (RNAME)
hostmaster.youku.com
Serial
2017041914
Refresh / retry
3600 s / 1200 s
Expire
3600 s
Negative TTL
360 s

Serial per nameserver

NameserverSerial
dns1.youku.com (140.205.103.193)2017041914
dns1.youku.com (2401:b180:4100::3)2017041914
dns2.youku.com (106.11.41.145)2017041914
dns2.youku.com (106.11.35.17)2017041914
dns2.youku.com (2401:b180:4100::8)2017041914
dns3.youku.com (47.241.207.17)2017041914
dns3.youku.com (47.88.74.37)2017041914
dns3.youku.com (2401:b180:4100::9)2017041914
dns4.youku.com (140.205.122.88)2017041914
dns4.youku.com (2401:b180:4100::10)2017041914

Checks

  • ✓ Serial 2017041914 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    expire 1h is shorter than 7d; secondaries stop answering too soon when the primary is down; expire 1h must be longer than refresh + retry. Current values: refresh 1h, retry 20m, expire 1h, negative TTL 6m.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver dns1.youku.com is one of the listed nameservers.
  • ✓ Contact hostmaster@youku.com #25
    The SOA RNAME hostmaster.youku.com means hostmaster@youku.com.
  • ✓ Date-based serial #26
    The serial 2017041914 follows the YYYYMMDDnn convention (2017-04-19).

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

pass

15 records at the apex

Found

Read from
140.205.103.193:53
TypeValueTTL
SOAdns1.youku.com. hostmaster.youku.com. 2017041914 3600 1200 3600 360600
NSdns4.youku.com.86400
NSdns3.youku.com.86400
NSdns2.youku.com.86400
NSdns1.youku.com.86400
A106.11.43.246300
AAAA2408:4001:f10::fd300
AAAA2408:4001:f10::8300
AAAA2408:4001:f00::3a300
AAAA2408:4001:f00::1af300
MX20 mx2.youku.com.300
MX20 mx1.youku.com.300
TXT"v=spf1 include:spf1.staff.mail.aliyun.com -all"300
TXT"_globalsign-domain-verification=tZ7FgEoUskFJpYv3ncv1X298Psdl-Kur0y6ZbKEhcl"300
CAA0 issue "globalsign.com"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, AAAA 5m, MX 5m, NS 1d. The NS TTL at the parent is 2d and in the zone 1d; resolvers may use either.
  • ✓ No CNAME at the apex #33
    The zone apex has no CNAME record.
  • ✓ No wildcard #34
    Names that don't exist return NXDOMAIN.
  • ✓ CAA restricts issuance #35
    Certificates may be issued by: globalsign.com.