On no blocklists we checked, valid HTTPS, the site answered 403 in 60 ms.
Rule-based: domain age, blocklists, TLS. A heuristic, not a guarantee.

| A | 172.66.152.158 104.20.38.180 |
|---|---|
| MX | 10 mail.listcrawler.eu |
| NS | donovan.ns.cloudflare.com amalia.ns.cloudflare.com |
| TXT | protonmail-verification=3b336a377269869274bd8a04626c848821b37d2b google-site-verification=Pl5ozuMDUJJS7SqEcckqi1sCAHNn3jO5aeCm9WyXUVw v=spf1 a mx ip4:37.48.73.64 ip4:185.17.144.145 ip4:5.79.70.244 ip4:81.171.2.169 ip4:212.32.240.180 ip4:37.48.120.188 ip4:5.79.113.224 ip4:81.171.24.155 ip4:37.48.87.250 ip4:37.48.120.16 ip4:37.48.87.189 ip4:84.16.227.146 include:_spf.protonmail.ch -all google-site-verification=OzLukqOQ3eTou_qAPQ8-05KiDMyojjAMx3KvocdTFr4 |
| valid | yes |
|---|---|
| issuer | Let's Encrypt |
| covers | *.com.listcrawler.eu, *.listcrawler.eu, listcrawler.eu |
| protocol | TLSv1.3 |
Domain is not signed with DNSSEC
| SPF | pass v=spf1 a mx ip4:37.48.73.64 ip4:185.17.144.145 ip4:5.79.70.244 ip4:81.171.2.169 ip4:212.32.240.180 ip4:37.48.120.188 ip4:5.79.113.224 ip4:81.171.24.155 ip4:37.48.87.250 ip4:37.48.120.16 ip4:37.48.87.189 ip4:84.16.227.146 include:_spf.protonmail.ch -all |
|---|---|
| DMARC | warning policy none |
| DKIM | found: mail, protonmail |
Whether mail claiming to be from this domain can be checked as genuine.
Green: clean. Red: listed. Grey: the list did not answer.
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.
MCP: add https://how.is/mcp to Claude, Codex or Cursor
(one-line install) and ask for domain_trust on listcrawler.eu.
Reference: /llms.txt.
Watch listcrawler.eu. 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