Public tools for a quick check. DNS and RDAP use this server as the client. HTTP check blocks localhost and private addresses. Traceroute and port scans are not here on purpose.
What’s my IP
Outside is the public address. Inside is only visible on the county LAN. Local on this device is a browser guess and often blocked off-network.
—
DNS lookup
Cloudflare and Google are public DoH. Local uses this server’s resolver (A/AAAA/CNAME/PTR only).
—
ARIN RDAP
IP or ASN. Example: 204.87.206.1 or AS402910.
—
HTTP check
HEAD request from this server. Status, time, certificate, and a URLhaus check for known malware or phishing hosts.
—
Mail auth
SPF, DMARC, and DKIM. Optional selector, or several separated by commas. Common names are still checked.
—
DNSBL
IPv4 against Spamhaus ZEN, SpamCop, Barracuda, and SORBS.
—