HOW.IS
?

How is kernel.org?

Looks fine risk 0/100

Registered 30 years ago, on no blocklists we checked, valid HTTPS, the site answered 200 in 109 ms.

Why

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

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

How kernel.org looks right now
The home page, rendered by how.is in a sandboxed browser. Nothing on it is clickable here.
Site
200
109 ms
HTTPS
74 d
left on a Let's Encrypt certificate
Age
30 years
registered 1997-03-07
Blocklists
0
listings across 5 lists

Everything we looked at

DNS records5 record types
A172.105.4.254
AAAA2600:3c04:e001:324:0:1991:8:25
MX10 smtp3.kernel.org
10 smtp1.kernel.org
10 smtp2.kernel.org
NSns11.constellix.com
ns41.constellix.net
ns51.constellix.net
ns31.constellix.com
ns61.constellix.net
ns21.constellix.com
TXTv=spf1 include:_spf.kernel.org ~all
google-site-verification=nb4Wx5xBQM3b-a3OV2KSlPL786714Y7M6GfBtJf1opQ
RegistrationGandi SAS
registrarGandi SAS
registered1997-03-07
expires2027-03-08
last changed2026-08-12
ownerThe Linux Foundation
nameserversns11.constellix.com
ns21.constellix.com
ns31.constellix.com
ns41.constellix.net
ns51.constellix.net
ns61.constellix.net
statusclient transfer prohibited
registered 1997-03-07expires 2027-03-08
HTTPS certificate74 days left
validyes
issuerLet's Encrypt
coversandroid.kernel.org, git.kernel.org, kernel.org, linux.kernel.org, lore.kernel.org, origin.kernel.org, tor.source.kernel.org, wireless.kernel.org, www.kernel.org
protocolTLSv1.3
issued 2026-10-14expires 2027-01-12
DNSSECinsecure

Domain is not signed with DNSSEC

. → org → kernel.org
Email authenticationexcellent
SPFpass v=spf1 include:_spf.kernel.org ~all
DMARCpass policy quarantine
DKIMfound: default

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

Security scoregrade B · 165/205
Basic Security
20/40missing: DNSSEC Enabled
Record Security
30/45missing: CAA Records, DKIM Presence
Advanced Security
20/25missing: SOA Record Configuration
Domain Reputation
50/50
Threat Detection
45/45missing: Domain Age Check
Blocklists0 listings · 5 lookups
SURBL MultidomainURIBL MultidomainSpamCop172.105.4.254Barracuda172.105.4.254UCEPROTECT Level 1172.105.4.254

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=kernel.org" \ -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=kernel.org"

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

Watch kernel.org. 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