How is signal.org?

Looks fine risk 0/100

Registered 26 years ago, on no blocklists we checked, valid HTTPS, the site answered 200 in 88 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

88 ms

HTTPS

31 d

left on a Google Trust Services certificate

Age

26 years

registered 2001-04-15

Blocklists

listings across 5 lists

Everything we looked at

DNS records5 record types

A	104.18.10.47 104.18.11.47
AAAA	2606:4700::6812:b2f 2606:4700::6812:a2f
MX	10 aspmx3.googlemail.com 10 aspmx2.googlemail.com 1 aspmx.l.google.com 5 alt2.aspmx.l.google.com 5 alt1.aspmx.l.google.com
NS	casey.ns.cloudflare.com zita.ns.cloudflare.com
TXT	v=spf1 include:_spf.google.com ~all anthropic-domain-verification-w1sp3g=yHrFLemYCHqI7Xa0hqH80GBFR stripe-verification=5CDC9F59F979D40BC9364506CB06E0795AD4487F53BA791A33A273F0FF551BAB google-site-verification=E9NOI9LjgLb5GEyCWbHTr8yumWFOdOuCtFkCeQ_GhVM atlassian-domain-verification=E0za3YlmgyiE3wck1TFwdW1j0dbRUDsSNh9VBjrOx4yMWdOdauAaLczjR2c/FFmr MS=ms64370964

RegistrationMarkMonitor Inc.

registrar	MarkMonitor Inc.
registered	2001-04-15
expires	2028-04-15
last changed	2026-08-12
owner	DNStination Inc.
nameservers	casey.ns.cloudflare.com zita.ns.cloudflare.com
status	client delete prohibited server delete prohibited client transfer prohibited server transfer prohibited client update prohibited server update prohibited

registered 2001-04-15expires 2028-04-15

HTTPS certificate31 days left

valid	yes
issuer	Google Trust Services
covers	signal.org
protocol	TLSv1.3

issued 2026-09-04expires 2026-12-03

DNSSECsecure

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

. → org → signal.org

Email authenticationexcellent

SPF	pass `v=spf1 include:_spf.google.com ~all`
DMARC	pass policy quarantine
DKIM	found: google

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

Security scoregrade B · 160/205

Basic Security

10/40missing: DNSSEC Enabled, Nameserver Diversity

Record Security

30/45missing: CAA Records, DKIM Presence

Advanced Security

25/25

Domain Reputation

50/50

Threat Detection

45/45missing: Domain Age Check

Blocklists0 listings · 8 lookups

SURBL MultidomainURIBL MultidomainSpamCop104.18.11.47Barracuda104.18.11.47UCEPROTECT Level 1104.18.11.47SpamCop104.18.10.47Barracuda104.18.10.47UCEPROTECT Level 1104.18.10.47

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=signal.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=signal.org"

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

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

Watch signal.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