HOW.IS
?

How is firefox-portal-detection.com?

Looks fine risk 15/100

Registered 4 months ago, on no blocklists we checked, valid HTTPS, the site answered 200 in 56 ms.

Why

02050100
finecarefulhigh risk
  • +15Registered 116 days ago (under six months).

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

How firefox-portal-detection.com looks right now
The home page, rendered by how.is in a sandboxed browser. Nothing on it is clickable here.
Site
200
56 ms
HTTPS
42 d
left on a Let's Encrypt certificate
Age
4 months
registered 2026-07-01
Blocklists
0
listings across 5 lists

Everything we looked at

DNS records3 record types
A151.101.65.91
151.101.1.91
151.101.193.91
151.101.129.91
AAAA2a04:4e42:400::347
2a04:4e42:200::347
2a04:4e42:600::347
2a04:4e42::347
NSns-cloud-d2.googledomains.com
ns-cloud-d1.googledomains.com
ns-cloud-d4.googledomains.com
ns-cloud-d3.googledomains.com
RegistrationMarkMonitor Inc.
registrarMarkMonitor Inc.
registered2026-07-01
expires2028-07-01
last changed2026-07-10
ownerMozilla Corporation
nameserversns-cloud-d1.googledomains.com
ns-cloud-d2.googledomains.com
ns-cloud-d3.googledomains.com
ns-cloud-d4.googledomains.com
statusclient delete prohibited
client transfer prohibited
client update prohibited
registered 2026-07-01expires 2028-07-01
HTTPS certificate42 days left
validyes
issuerLet's Encrypt
coversdetectportal-fastly.firefox.com, detectportal.firefox.com, firefox-portal-detection.com
protocolTLSv1.3
issued 2026-09-08expires 2026-12-07
DNSSECinsecure

Domain is not signed with DNSSEC

. → com → firefox-portal-detection.com
Email authenticationpoor
SPFnone
DMARCnone
DKIMnone of 1 common selectors

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

Security scoregrade C · 120/205
Basic Security
10/40missing: DNSSEC Enabled, Nameserver Diversity
Record Security
0/45missing: CAA Records, SPF Record, DMARC Record, DKIM Presence
Advanced Security
15/25missing: Mail Server Configuration
Domain Reputation
50/50
Threat Detection
45/45missing: Domain Age Check
Blocklists0 listings · 14 lookups
SURBL MultidomainURIBL MultidomainSpamCop151.101.193.91Barracuda151.101.193.91UCEPROTECT Level 1151.101.193.91SpamCop151.101.129.91Barracuda151.101.129.91UCEPROTECT Level 1151.101.129.91SpamCop151.101.65.91Barracuda151.101.65.91UCEPROTECT Level 1151.101.65.91SpamCop151.101.1.91Barracuda151.101.1.91UCEPROTECT Level 1151.101.1.91

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=firefox-portal-detection.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=firefox-portal-detection.com"

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

Watch firefox-portal-detection.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