HOW.IS
?

How is tumblr.com?

Looks fine risk 0/100

Registered 20 years ago, on no blocklists we checked, valid HTTPS, the site answered 200 in 44 ms.

Why

02050100
finecarefulhigh risk
  • ·Nothing in the checks added risk.

Rule-based: domain age, blocklists, TLS. A heuristic, not a guarantee.

How tumblr.com looks right now
The home page, rendered by how.is in a sandboxed browser. Nothing on it is clickable here.
Site
200
44 ms · ends at www.tumblr.com
HTTPS
41 d
left on a Let's Encrypt certificate
Age
20 years
registered 2006-06-08
Blocklists
0
listings across 5 lists

Everything we looked at

DNS records5 record types
A192.0.77.40
MX5 alt1.aspmx.l.google.com
10 aspmx3.googlemail.com
1 aspmx.l.google.com
10 aspmx2.googlemail.com
5 alt2.aspmx.l.google.com
NSns3.tumblr.com
ns4.tumblr.com
ns2.tumblr.com
ns1.tumblr.com
TXTdocusign=89f952a7-e765-4f50-a3d7-9de3cd65cac4
v=spf1 include:_spf.google.com include:_spf.automattic.com include:sendgrid.net include:mail.zendesk.com include:21055259.spf05.hubspotemail.net -all
dropbox-domain-verification=gsvpgz511vsp
google-site-verification=evUIJKvsT_rKVFCun0dPbCRHgQqDz1L3f36AjHyVuL4
google-site-verification=p3225uNj2Zmz4RRSuvITsVPAlTsPcdN0JAm8QJ5sii4
896862773-6204718
google-site-verification=CnMcqJES0ObJWvPivA5DBJFXKOryg0I9rA5JPro-Sdc
google-site-verification=juLeQVndZxEsqhKFQS09fSxOZ3d2Jx2BWZqaLXakugw
google-site-verification=49CbL4sd1lOCXXoGx4wSFD87B5_Py3QGacMNlrWK4Tw
mailru-verification: c8b795f0ae1cbc3f
yahoo-verification-key=+HOWRlDLIp3tUwSLvdfWrcKzs6tWS/LkZFYp8XGzC6k=
wtcg10h9bh0nrxglf6zc3p8mxy5t3mw9
figma-domain-verification=a2e41510ac6b0c5745595c76770385bfd602709c6d04e80ef830c9c482fc9e20-1768211767
atlassian-domain-verification=HLvi8VknRfLwuOZ7TmiaKM8GgOgai45SxxeWZddVaOBMgWielcwit/LmLXXPJm6G
f050f00fa3c941ea9ee3f76fc6562a11
CAA{'type': 'CAA', 'issue': 'pki.goog', 'critical': 0}
{'type': 'CAA', 'issue': 'comodoca.com', 'critical': 0}
{'type': 'CAA', 'issue': 'letsencrypt.org', 'critical': 0}
{'type': 'CAA', 'issue': 'digicert.com', 'critical': 0}
{'type': 'CAA', 'iodef': 'mailto:content-delivery+caa@tumblr.com', 'critical': 0}
RegistrationMarkMonitor Inc.
registrarMarkMonitor Inc.
registered2006-06-08
expires2027-06-08
last changed2025-05-07
ownerREDACTED FOR PRIVACY
nameserversns1.tumblr.com
ns2.tumblr.com
ns3.tumblr.com
ns4.tumblr.com
statusclient delete prohibited
client transfer prohibited
client update prohibited
server delete prohibited
server transfer prohibited
server update prohibited
registered 2006-06-08expires 2027-06-08
HTTPS certificate41 days left
validyes
issuerLet's Encrypt
covers*.tumblr.com, tumblr.com
protocolTLSv1.3
issued 2026-09-07expires 2026-12-06
DNSSECinsecure

Domain is not signed with DNSSEC

. → com → tumblr.com
Email authenticationexcellent
SPFpass v=spf1 include:_spf.google.com include:_spf.automattic.com include:sendgrid.net include:mail.zendesk.com include:21055259.spf05.hubspotemail.net -all
DMARCpass policy quarantine
DKIMfound: google

Whether mail claiming to be from this domain can be checked as genuine.

Security scoregrade B · 150/205
Basic Security
10/40missing: DNSSEC Enabled, Nameserver Diversity
Record Security
45/45missing: DKIM Presence
Advanced Security
20/25missing: IPv6 Support
Domain Reputation
50/50
Threat Detection
25/45missing: DGA Detection, Domain Age Check
Blocklists0 listings · 5 lookups
SURBL MultidomainURIBL MultidomainSpamCop192.0.77.40Barracuda192.0.77.40UCEPROTECT Level 1192.0.77.40

Green: clean. Red: listed. Grey: the list did not answer.

Ask it yourself

Agents get this as data. Bought through the API, the checks behind this page cost $0.070: profile $0.025 + trust $0.020 + screenshot $0.020 + site status $0.005.

curl "https://how.is/v1/domain/trust?domain=tumblr.com" \ -H "Authorization: Bearer $HOWIS_KEY" # or pay per call in USDC (x402), no key: the 402 tells your agent the price curl -i "https://how.is/v1/domain/profile?domain=tumblr.com"

MCP: add https://how.is/mcp to Claude, Codex or Cursor (one-line install) and ask for domain_trust on tumblr.com. Reference: /llms.txt.

Watch tumblr.com. DNS read at the source every 5 minutes; certificate, blocklists and expiry every 6 hours. You get an email only when something changes.

Watch — $1 / 30 days