tumblr.com

.com generic · MarkMonitor Inc. · expires 2027-06-08

Found

TLD

.com (generic)

ICANN policies apply

yes

Registrar

MarkMonitor Inc.

Registered

8 June 2006

Last changed

7 May 2025

Expires

8 June 2027

Status

client delete prohibited, client transfer prohibited, client update prohibited, server delete prohibited, server transfer prohibited, server 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 2027-06-08 #3

  The registration is valid until 2027-06-08 (229 days).
• ✓ Transfer locked #4

  Registry status: client delete prohibited, client transfer prohibited, client update 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.

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

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.
• ✓ Glue present and correct #8

  Glue is published for the nameservers inside the zone: ns1.tumblr.com, ns2.tumblr.com, ns3.tumblr.com, ns4.tumblr.com.
• ✓ 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.

8 of 8 addresses answer authoritatively

Found

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.

31 records at the apex

Found

Read from

198.181.116.11:53

Checks

• ✓ TTLs within range #32

  TTLs: A 5m, 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.
• 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
• ✓ CAA restricts issuance #35

  Certificates may be issued by: digicert.com, letsencrypt.org, comodoca.com, pki.goog.