Free online utilities for domains and IPs — no account required.
HTTP status, headers and redirect chain.
Latency check (ICMP or TCP fallback).
Is the site up? Timing and status code.
Registrar, dates, nameservers and status.
IP, country, city, ISP / ASN.
A, AAAA, MX, NS, TXT, CNAME records.
Issuer, validity dates and SANs.
Resolve domain ↔ IP, reverse DNS.
Quick scan of common TCP ports.
DNSBL reputation for the host IP.
Follow HTTP redirects step by step.
Fetch robots.txt and detect Sitemap links.
SPF, DMARC and MX records for the domain.
Lighthouse performance score (mobile & desktop).