How is cairn.info?

Looks fine risk 0/100

Registered 25 years ago, on no blocklists we checked, valid HTTPS, the site answered 403 in 353 ms.

Why

02050100

finecarefulhigh risk

·Nothing in the checks added risk.

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

The home page, rendered by how.is in a sandboxed browser. Nothing on it is clickable here.

Site

403

353 ms

HTTPS

35 d

left on a Let's Encrypt certificate

Age

25 years

registered 2001-09-13

Blocklists

listings across 5 lists

Everything we looked at

DNS records4 record types

A	185.34.32.93
MX	20 mail.cairn.info
NS	ns1.eurodns.com ns2.eurodns.com
TXT	google-site-verification=51wcy859KZQ-uBWhFyW6AVZ2nKNl7szoEtUWFhjJeXs MS=ms46042896 v=spf1 ip4:212.83.144.39 ip4:77.159.229.108 include:spf.ourmailsender.com include:spf.octopuce.fr a mx include:servers.mcsv.net include:helpscoutemail.com -all

RegistrationEuroDNS S.A.

registrar	EuroDNS S.A.
registered	2001-09-13
expires	2027-09-13
last changed	2026-08-12
owner	CAIRN.INFO SAS
nameservers	ns1.eurodns.com ns2.eurodns.com
status	active

registered 2001-09-13expires 2027-09-13

HTTPS certificate35 days left

valid	yes
issuer	Let's Encrypt
covers	cairn.info
protocol	TLSv1.3

issued 2026-09-21expires 2026-12-20

DNSSECinsecure

Domain is not signed with DNSSEC

. → info → cairn.info

Email authenticationgood

SPF	pass `v=spf1 ip4:212.83.144.39 ip4:77.159.229.108 include:spf.ourmailsender.com include:spf.octopuce.fr a mx include:servers.mcsv.net include:helpscoutemail.com -all`
DMARC	warning policy none
DKIM	found: default, k1

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

Security scoregrade C · 143/205

Basic Security

10/40missing: DNSSEC Enabled, Nameserver Diversity

Record Security

23/45missing: CAA Records, DMARC Record, DKIM Presence

Advanced Security

15/25missing: Mail Server Configuration, IPv6 Support

Domain Reputation

50/50

Threat Detection

45/45missing: Domain Age Check

Blocklists0 listings · 5 lookups

SURBL MultidomainURIBL MultidomainSpamCop185.34.32.93Barracuda185.34.32.93UCEPROTECT Level 1185.34.32.93

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=cairn.info" \ -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=cairn.info"

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

IPv6. Does cairn.info work over IPv6? See the live check on aaaa.bot — website, mail and nameservers, graded A–F.

Watch cairn.info. 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