How is resolver.arpa?

Be careful risk 20/100

Registered 4 years ago, no valid HTTPS certificate, the site did not answer (OSError).

Why

02050100

finecarefulhigh risk

+20No valid HTTPS certificate.

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

Site

down

OSError

HTTPS

invalid

Could not resolve host (ENODATA)

Age

4 years

registered 2022-09-01

Blocklists

listings across 2 lists

Everything we looked at

DNS records0 record types

Registrationregistrar not reported

registered	2022-09-01

HTTPS certificatenot valid

valid	no
problem	Could not resolve host (ENODATA)

DNSSECsecure

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

. → arpa → resolver.arpa

Email authenticationpoor

SPF	none
DMARC	none
DKIM	none of 1 common selectors

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

Security scoregrade D · 90/190

Basic Security

0/40missing: DNSSEC Enabled, Multiple Nameservers, Nameserver Diversity

Record Security

0/45missing: CAA Records, SPF Record, DMARC Record, DKIM Presence

Advanced Security

10/25missing: Mail Server Configuration, IPv6 Support

Domain Reputation

35/35

Threat Detection

45/45missing: Domain Age Check

Blocklists0 listings · 2 lookups

SURBL MultidomainURIBL Multidomain

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=resolver.arpa" \ -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=resolver.arpa"

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

Watch resolver.arpa. 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