youdao.com

Checked 22 October 2026, 11:41 UTC · via 8.8.8.8
!Passed with warnings
23 passed 3 warnings 0 failed 5 info

Registration

info

.com generic · Alibaba Cloud Computing (Beijing) Co., Ltd. · expires 2027-06-15

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Alibaba Cloud Computing (Beijing) Co., Ltd.
Registered
15 June 2002
Last changed
19 May 2025
Expires
15 June 2027
Status
active
Registry nameservers
rem1.yodao.net, rem2.yodao.net, rem3.yodao.net
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 2027-06-15 #3
    The registration is valid until 2027-06-15 (235 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

rem1.yodao.net, rem2.yodao.net, rem3.yodao.net

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
rem1.yodao.net, rem2.yodao.net, rem3.yodao.net
NS in the zone
rem1.yodao.net, rem2.yodao.net, rem3.yodao.net
NameserverAddressesNetwork (AS)Glue
rem1.yodao.net8.221.193.169 47.251.116.74 47.84.150.132AS45102 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-
rem2.yodao.net8.221.191.122 156.225.180.108AS45102 ALIBABA-CN-NET - Alibaba (US) Technology Co., Ltd., CN AS137263 NETEASE-AS-AP - NETEASE HONG KONG LIMITED, HK-
rem3.yodao.net47.251.18.141 47.84.149.100AS45102 ALIBABA-CN-NET - Alibaba (US) Technology Co., Ltd., CN AS45102 ALIBABA-CN-NET - Alibaba (US) Technology Co., Ltd., CN-

Checks

  • ✓ 3 nameservers #6
    Delegated to rem1.yodao.net, rem2.yodao.net, rem3.yodao.net.
  • ✓ 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.
  • ✓ Nameservers in different networks #10
    The nameservers are spread over 7 IPv4 /24s and 0 IPv6 /48s.
  • ✓ 2 autonomous systems #11
    The nameservers are spread over: AS137263 (NETEASE-AS-AP - NETEASE HONG KONG LIMITED, HK): 1 address; AS45102 (ALIBABA-CN-NET - Alibaba (US) Technology Co., Ltd., CN): 6 addresses.
  • i
    All nameserver names under .net
    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
  • !
    No IPv6
    None of the nameservers has an IPv6 address, so IPv6-only resolvers can't reach them.
    #13

Nameservers

info

7 of 7 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
rem1.yodao.net 8.221.193.169NOERROR, 235 ms, authoritativenoyes / yesrefusedrem1-jp
rem1.yodao.net 47.251.116.74NOERROR, 155 ms, authoritativenoyes / yesrefusedrem1-us
rem1.yodao.net 47.84.150.132NOERROR, 188 ms, authoritativenoyes / yesrefusedrem1-sg
rem2.yodao.net 8.221.191.122NOERROR, 244 ms, authoritativenoyes / yesrefusedrem2-jp
rem2.yodao.net 156.225.180.108NOERROR, 184 ms, authoritativenoyes / yesrefusedrem4-wg
rem3.yodao.net 47.251.18.141NOERROR, 156 ms, authoritativenoyes / yesrefusedrem1-us
rem3.yodao.net 47.84.149.100NOERROR, 187 ms, authoritativenoyes / yesrefusedrem1-sg

Checks

  • ✓ All respond #14
    All 7 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.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: rem1.yodao.net: "rem1-jp"; rem1.yodao.net: "rem1-us"; rem1.yodao.net: "rem1-sg"; rem2.yodao.net: "rem2-jp"; rem2.yodao.net: "rem4-wg"; rem3.yodao.net: "rem1-us"; rem3.yodao.net: "rem1-sg".
    #17
  • ✓ 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 1792665558 · primary rem1.yodao.net

Found

Primary (MNAME)
rem1.yodao.net
Contact (RNAME)
maintain.rd.netease.com
Serial
1792665558
Refresh / retry
10800 s / 900 s
Expire
86400 s
Negative TTL
600 s

Serial per nameserver

NameserverSerial
rem1.yodao.net (8.221.193.169)1792665558
rem1.yodao.net (47.251.116.74)1792665558
rem1.yodao.net (47.84.150.132)1792665558
rem2.yodao.net (8.221.191.122)1792665558
rem2.yodao.net (156.225.180.108)1792665558
rem3.yodao.net (47.251.18.141)1792665558
rem3.yodao.net (47.84.149.100)1792665558

Checks

  • ✓ Serial 1792665558 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    expire 1d is shorter than 7d; secondaries stop answering too soon when the primary is down. Current values: refresh 3h, retry 15m, expire 1d, negative TTL 10m.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver rem1.yodao.net is one of the listed nameservers.
  • ✓ Contact maintain@rd.netease.com #25
    The SOA RNAME maintain.rd.netease.com means maintain@rd.netease.com.
  • ✓ Timestamp serial #26
    The serial 1792665558 is a Unix timestamp (2026-10-22 10:39 UTC).

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

info

8 records at the apex

Found

Read from
8.221.193.169:53
TypeValueTTL
SOArem1.yodao.net. maintain.rd.netease.com. 1792665558 10800 900 86400 600600
NSrem3.yodao.net.86400
NSrem1.yodao.net.86400
NSrem2.yodao.net.86400
A220.197.31.37600
MX10 hzmx01.mxmail.netease.com.600
MX20 hzmx02.mxmail.netease.com.600
TXT"v=spf1 include:spf.163.com ip4:61.135.221.0/24 ip4:123.58.182.192/26 ip4:220.181.8.0/24 -all"600

Checks

  • ✓ TTLs within range #32
    TTLs: A 10m, MX 10m, 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.
  • 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