userapi.com

Checked 22 October 2026, 11:16 UTC · via 8.8.8.8
✗Problems found
21 passed 2 warnings 1 failed 7 info

Registration

info

.com generic · Regional Network Information Center, JSC dba RU-CENTER · expires 2027-09-24

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
Regional Network Information Center, JSC dba RU-CENTER
Registered
24 September 2008
Last changed
23 September 2026
Expires
24 September 2027
Status
client transfer prohibited
Registry nameservers
ns1.vkontakte.ru, ns2.vkontakte.ru, ns3.vkontakte.ru, ns4.vkontakte.ru
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 2027-09-24 #3
    The registration is valid until 2027-09-24 (337 days).
  • ✓ Transfer locked #4
    Registry status: client transfer prohibited.
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

info

ns1.vkontakte.ru, ns2.vkontakte.ru, ns3.vkontakte.ru, ns4.vkontakte.ru

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns1.vkontakte.ru, ns2.vkontakte.ru, ns3.vkontakte.ru, ns4.vkontakte.ru
NS in the zone
ns1.vkontakte.ru, ns2.vkontakte.ru, ns3.vkontakte.ru, ns4.vkontakte.ru
NameserverAddressesNetwork (AS)Glue
ns1.vkontakte.ru87.240.131.131 2a00:bdc0:ff:1::2AS47541 VKONTAKTE-SPB-AS - LLC VK, RU AS47541 VKONTAKTE-SPB-AS - LLC VK, RU-
ns2.vkontakte.ru95.213.21.21 2a00:bdc0:ff:2::2AS47541 VKONTAKTE-SPB-AS - LLC VK, RU AS47541 VKONTAKTE-SPB-AS - LLC VK, RU-
ns3.vkontakte.ru93.186.238.238 2a00:bdc0:ff:3::2AS47541 VKONTAKTE-SPB-AS - LLC VK, RU AS47541 VKONTAKTE-SPB-AS - LLC VK, RU-
ns4.vkontakte.ru87.240.136.136 2a00:bdc0:ff:4::2AS47541 VKONTAKTE-SPB-AS - LLC VK, RU AS47541 VKONTAKTE-SPB-AS - LLC VK, RU-

Checks

  • ✓ 4 nameservers #6
    Delegated to ns1.vkontakte.ru, ns2.vkontakte.ru, ns3.vkontakte.ru, ns4.vkontakte.ru.
  • ✓ 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 2a00:bdc0:ff::/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 (AS47541 (VKONTAKTE-SPB-AS - LLC VK, RU): 8 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 .ru
    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

4 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.vkontakte.ru 87.240.131.131NOERROR, 38 ms, authoritativenoyes / yesrefusedTo be non-disclosed
ns1.vkontakte.ru 2a00:bdc0:ff:1::2no responsenono / no--
ns2.vkontakte.ru 95.213.21.21NOERROR, 42 ms, authoritativenoyes / yesrefusedTo be non-disclosed
ns2.vkontakte.ru 2a00:bdc0:ff:2::2no responsenono / no--
ns3.vkontakte.ru 93.186.238.238NOERROR, 39 ms, authoritativenoyes / yesrefusedTo be non-disclosed
ns3.vkontakte.ru 2a00:bdc0:ff:3::2no responsenono / no--
ns4.vkontakte.ru 87.240.136.136NOERROR, 39 ms, authoritativenoyes / yesrefusedTo be non-disclosed
ns4.vkontakte.ru 2a00:bdc0:ff:4::2no responsenono / no--

Checks

  • ✗
    Nameservers not responding
    These addresses did not answer, so resolvers waste time on timeouts: ns1.vkontakte.ru (2a00:bdc0:ff:1::2): read udp [2a01:4f8:1c1c:eebf::1]:43985->[2a00:bdc0:ff:1::2]:53: i/o timeout; ns2.vkontakte.ru (2a00:bdc0:ff:2::2): read udp [2a01:4f8:1c1c:eebf::1]:58424->[2a00:bdc0:ff:2::2]:53: i/o timeout; ns3.vkontakte.ru (2a00:bdc0:ff:3::2): read udp [2a01:4f8:1c1c:eebf::1]:41385->[2a00:bdc0:ff:3::2]:53: i/o timeout; ns4.vkontakte.ru (2a00:bdc0:ff:4::2): read udp [2a01:4f8:1c1c:eebf::1]:36205->[2a00:bdc0:ff:4::2]: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.
  • i
    Identifying string disclosed
    These nameservers answer version queries with a string that is not a version number: ns1.vkontakte.ru: "To be non-disclosed"; ns2.vkontakte.ru: "To be non-disclosed"; ns3.vkontakte.ru: "To be non-disclosed"; ns4.vkontakte.ru: "To be non-disclosed".
    #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 3583516625 · primary ns1.vkontakte.ru

Found

Primary (MNAME)
ns1.vkontakte.ru
Contact (RNAME)
ncc.vk.com
Serial
3583516625
Refresh / retry
900 s / 600 s
Expire
604800 s
Negative TTL
7200 s

Serial per nameserver

NameserverSerial
ns1.vkontakte.ru (87.240.131.131)3583516625
ns2.vkontakte.ru (95.213.21.21)3583516625
ns3.vkontakte.ru (93.186.238.238)3583516625
ns4.vkontakte.ru (87.240.136.136)3583516625

Checks

  • ✓ Serial 3583516625 everywhere #22
    All nameservers serve the same version of the zone.
  • !
    Unusual SOA timers
    refresh 15m is outside 20m–1d. Current values: refresh 15m, retry 10m, expire 7d, negative TTL 2h.
    #23
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.vkontakte.ru is one of the listed nameservers.
  • ✓ Contact ncc@vk.com #25
    The SOA RNAME ncc.vk.com means ncc@vk.com.
  • ✓ Timestamp serial #26
    The serial 3583516625 is a Unix timestamp (2083-07-22 21:17 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

19 records at the apex

Found

Read from
87.240.131.131:53
TypeValueTTL
SOAns1.vkontakte.ru. ncc.vk.com. 3583516625 900 600 604800 7200300
NSns1.vkontakte.ru.300
NSns4.vkontakte.ru.300
NSns3.vkontakte.ru.300
NSns2.vkontakte.ru.300
A87.240.190.64300
A87.240.129.187300
MX0 mx.vk.com.300
TXT"HARICA-8jVHl95rzphvOFzzWX7"300
TXT"HARICA-0W0o44c9DyE61DEvL5H"300
TXT"_globalsign-domain-verification=Ldp0yHWVZFPvYhD5fv1Cc9Z6N1qveliT6uzxwdrr9C"300
TXT"_globalsign-domain-verification=MTlPckbrbufqf1JnpHMmOmwzo8YGGLlvWrcq6GWzyT"300
TXT"v=spf1 -all"300
TXT"atJ1QQ0fGXlJSD9DKrPatRQAB83O7mfrJvGeRBNgitM="300
TXT"_globalsign-domain-verification=6gPgwhJkX4uBuKXUE5O7y9oUmtXB-CAJv9xnFqikEy"300
TXT"HARICA-7rMvGABnKMnABT4yIpZ"300
TXT"HARICA-1ObFuIyyYSvGS21lPSl"300
TXT"_globalsign-domain-verification=7yYVJvdrWz05cbzkQl-l0yVYWsP6gDO5u194Ic8KA8"300
TXT"_globalsign-domain-verification=O0Pt8zhXN9vdBLKTxOu4bCXzcpDWeAUl7l3Ar9XFUH"300

Checks

  • ✓ TTLs within range #32
    TTLs: A 5m, MX 5m, NS 5m. The NS TTL at the parent is 2d and in the zone 5m; resolvers may use either.
  • ✓ 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