3 services carry this tag in their source record. Tags come from the provider, not from us — a tag is a claim about what the service does, not proof that it does it well.
DNS propagation checker. Compares a DNS record across public resolvers (Google, Cloudflare, Quad9, OpenDNS) to spot propagation lag or split-horizon answers.
Check the TLS certificate a domain serves on port 443: whether it chains to a trusted root, matches the name (RFC 9525) and when it expires, with issuer, chain, key and signature algorithm, TLS version and coded findings...
DNS propagation check: resolves a domain's A and MX records through three independent public resolvers (Cloudflare 1.1.1.1, Google 8.8.8.8, Quad9) and reports whether all agree. Verify a DNS change has propagated after a...