How is rfc-editor.org?

Looks fine risk 0/100

Registered 28 years ago, on no blocklists we checked, valid HTTPS, the site answered 200 in 118 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

200

118 ms · ends at www.rfc-editor.org

HTTPS

84 d

left on a Google Trust Services certificate

Age

28 years

registered 1998-05-15

Blocklists

listings across 5 lists

Everything we looked at

DNS records5 record types

A	104.18.20.81 104.18.21.81
AAAA	2606:4700::6812:1551 2606:4700::6812:1451
MX	0 mx.ietf.org
NS	ken.ns.cloudflare.com jill.ns.cloudflare.com
TXT	google-site-verification=S7F2LDRmYAIwFs4JZtnDdmZH23mNreKn8qKn2qkBcHs v=spf1 ip4:166.84.6.31 ip4:166.84.7.238 ip6:2602:f977:800:f7f6::/64 ip4:166.84.7.34 ip6:2602:f977:800::e276:63ff:fe66:3400 include:_spf.google.com include:spf.hostedrt.com ~all

RegistrationCloudflare, Inc.

registrar	Cloudflare, Inc.
registered	1998-05-15
expires	2031-05-14
last changed	2026-08-12
owner	DATA REDACTED
nameservers	jill.ns.cloudflare.com ken.ns.cloudflare.com
status	server delete prohibited client transfer prohibited

registered 1998-05-15expires 2031-05-14

HTTPS certificate84 days left

valid	yes
issuer	Google Trust Services
covers	rfc-editor.org, diff.staging.rfc-editor.org
protocol	TLSv1.3

issued 2026-10-22expires 2027-01-20

DNSSECsecure

Domain is properly signed — chain validated by an independent validating resolver

. → org → rfc-editor.org

Email authenticationgood

SPF	pass `v=spf1 ip4:166.84.6.31 ip4:166.84.7.238 ip6:2602:f977:800:f7f6::/64 ip4:166.84.7.34 ip6:2602:f977:800::e276:63ff:fe66:3400 include:_spf.google.com include:spf.hostedrt.com ~all`
DMARC	warning policy none
DKIM	found: mail

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

Security scoregrade B · 148/205

Basic Security

10/40missing: DNSSEC Enabled, Nameserver Diversity

Record Security

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

Advanced Security

20/25missing: Mail Server Configuration

Domain Reputation

50/50

Threat Detection

45/45missing: Domain Age Check

Blocklists0 listings · 8 lookups

SURBL MultidomainURIBL MultidomainSpamCop104.18.20.81Barracuda104.18.20.81UCEPROTECT Level 1104.18.20.81SpamCop104.18.21.81Barracuda104.18.21.81UCEPROTECT Level 1104.18.21.81

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=rfc-editor.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=rfc-editor.org"

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

Watch rfc-editor.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