umblr.com

Checked 22 October 2026, 11:15 UTC · via 8.8.8.8
!Passed with warnings
26 passed 1 warning 0 failed 4 info

Registration

info

.com generic · MarkMonitor Inc. · expires 2027-12-06

Found

TLD
.com (generic)
ICANN policies apply
yes
Registrar
MarkMonitor Inc.
Registered
6 December 2008
Last changed
4 November 2025
Expires
6 December 2027
Status
client delete prohibited, client transfer prohibited, client update prohibited
Registry nameservers
ns1.tumblr.com, ns2.tumblr.com, ns3.tumblr.com, ns4.tumblr.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 2027-12-06 #3
    The registration is valid until 2027-12-06 (410 days).
  • ✓ Transfer locked #4
    Registry status: client delete prohibited, client transfer prohibited, client update prohibited.
  • ✓ Registry and delegation match #5
    The nameservers registered at the registry are the ones published in DNS.

Delegation

info

ns1.tumblr.com, ns2.tumblr.com, ns3.tumblr.com, ns4.tumblr.com

Found

Parent zone
com
Delegation from
a.gtld-servers.net (192.5.6.30)
NS at the parent
ns1.tumblr.com, ns2.tumblr.com, ns3.tumblr.com, ns4.tumblr.com
NS in the zone
ns1.tumblr.com, ns2.tumblr.com, ns3.tumblr.com, ns4.tumblr.com
NameserverAddressesNetwork (AS)Glue
ns1.tumblr.com198.181.116.11 2a04:fa87:ffff::c6b5:740bAS2635 AUTOMATTIC - Automattic, Inc, US AS2635 AUTOMATTIC - Automattic, Inc, US198.181.116.11 2a04:fa87:ffff::c6b5:740b
ns2.tumblr.com198.181.117.11 2a04:fa87:ffff::c6b5:750bAS2635 AUTOMATTIC - Automattic, Inc, US AS2635 AUTOMATTIC - Automattic, Inc, US198.181.117.11 2a04:fa87:ffff::c6b5:750b
ns3.tumblr.com192.0.74.11 2620:115:c00f::c000:4a0bAS2635 AUTOMATTIC - Automattic, Inc, US AS2635 AUTOMATTIC - Automattic, Inc, US192.0.74.11 2620:115:c00f::c000:4a0b
ns4.tumblr.com192.0.75.11 2620:115:c00f::c000:4b0bAS2635 AUTOMATTIC - Automattic, Inc, US AS2635 AUTOMATTIC - Automattic, Inc, US192.0.75.11 2620:115:c00f::c000:4b0b

Checks

  • ✓ 4 nameservers #6
    Delegated to ns1.tumblr.com, ns2.tumblr.com, ns3.tumblr.com, ns4.tumblr.com.
  • ✓ 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 4 IPv4 /24s and 2 IPv6 /48s.
  • i
    All nameservers in one AS
    All nameserver addresses are announced by one network operator (AS2635 (AUTOMATTIC - Automattic, Inc, US): 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 .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

info

8 of 8 addresses answer authoritatively

Found

NameserverAnswerRecursionTCP / EDNSAXFRVersion
ns1.tumblr.com 198.181.116.11NOERROR, 3 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
ns1.tumblr.com 2a04:fa87:ffff::c6b5:740bNOERROR, 4 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
ns2.tumblr.com 198.181.117.11NOERROR, 3 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
ns2.tumblr.com 2a04:fa87:ffff::c6b5:750bNOERROR, 4 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
ns3.tumblr.com 192.0.74.11NOERROR, 3 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
ns3.tumblr.com 2620:115:c00f::c000:4a0bNOERROR, 4 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
ns4.tumblr.com 192.0.75.11NOERROR, 3 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/
ns4.tumblr.com 2620:115:c00f::c000:4b0bNOERROR, 4 ms, authoritativenoyes / yesrefusedServed by PowerDNS - https://www.powerdns.com/

Checks

  • ✓ All respond #14
    All 8 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: ns1.tumblr.com: "Served by PowerDNS - https://www.powerdns.com/"; ns2.tumblr.com: "Served by PowerDNS - https://www.powerdns.com/"; ns3.tumblr.com: "Served by PowerDNS - https://www.powerdns.com/"; ns4.tumblr.com: "Served by PowerDNS - https://www.powerdns.com/".
    #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

pass

serial 2026101502 · primary ns1.tumblr.com

Found

Primary (MNAME)
ns1.tumblr.com
Contact (RNAME)
hostmaster.tumblr.com
Serial
2026101502
Refresh / retry
10800 s / 3600 s
Expire
604800 s
Negative TTL
3600 s

Serial per nameserver

NameserverSerial
ns1.tumblr.com (198.181.116.11)2026101502
ns1.tumblr.com (2a04:fa87:ffff::c6b5:740b)2026101502
ns2.tumblr.com (198.181.117.11)2026101502
ns2.tumblr.com (2a04:fa87:ffff::c6b5:750b)2026101502
ns3.tumblr.com (192.0.74.11)2026101502
ns3.tumblr.com (2620:115:c00f::c000:4a0b)2026101502
ns4.tumblr.com (192.0.75.11)2026101502
ns4.tumblr.com (2620:115:c00f::c000:4b0b)2026101502

Checks

  • ✓ Serial 2026101502 everywhere #22
    All nameservers serve the same version of the zone.
  • ✓ Timers within recommendations #23
    SOA refresh 3h, retry 1h, expire 7d, negative TTL 1h.
  • ✓ Primary is a public nameserver #24
    The primary nameserver ns1.tumblr.com is one of the listed nameservers.
  • ✓ Contact hostmaster@tumblr.com #25
    The SOA RNAME hostmaster.tumblr.com means hostmaster@tumblr.com.
  • ✓ Date-based serial #26
    The serial 2026101502 follows the YYYYMMDDnn convention (2026-10-15).

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

10 records at the apex

Found

Read from
198.181.116.11:53
TypeValueTTL
SOAns1.tumblr.com. hostmaster.tumblr.com. 2026101502 10800 3600 604800 36003600
NSns1.tumblr.com.86400
NSns3.tumblr.com.86400
NSns4.tumblr.com.86400
NSns2.tumblr.com.86400
A74.114.154.211800
A74.114.154.171800
MX0 .1800
CAA0 iodef "mailto:content-delivery+caa@tumblr.com"86400
CAA0 issue "letsencrypt.org;validationmethods=dns-01;accounturi=https://acme-v02.api.letsencrypt.org/acme/acct/36334489"86400

Checks

  • ✓ TTLs within range #32
    TTLs: A 30m, MX 30m, 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: letsencrypt.org.