PingOmni

DNS & Email tools.

Look up DNS records across locations and check DNSSEC, then a domain’s whole email setup: MX, SPF, DMARC, DKIM, MTA-STS, its mail server’s TLS, registration and spam lists. Free, no sign-up.

DNS lookup

Best for: Inspecting a name’s records, or comparing answers across locations after a change.

For PTR, an IP address also works.
More options
Which DNS server answers. “The domain’s own name server” skips caches and shows what the zone itself publishes (our server only).

Runs from our server, asking our server’s resolver.

Results appear here after you press Check DNS.

Troubleshooting step by step

Run any tool and these links carry its target along. Nothing runs until you press a tool’s button.

Connectivity

A website or service is unreachable

  1. PingDoes the host answer at all, and how fast?
  2. TracerouteWhere along the path do responses stop?
  3. MTRIs there loss that carries through to the destination?
  4. Port checkIs the service’s own TCP port reachable?
Domain and DNS

A domain does not resolve correctly

  1. DNS lookupWhat do resolvers answer, and with which status?
  2. NS checkDo all name servers answer and agree?
  3. DNSSEC checkIs DNSSEC broken, so validating resolvers refuse it?
  4. Registration lookupIs it registered, active, and delegated to those servers?
  5. Port checkDoes the address it resolves to accept connections?
Email

Email is not arriving or lands in spam

  1. MX checkWhich servers receive the domain’s mail?
  2. SPF checkWhich servers may send as the domain?
  3. DMARC checkWhat happens to mail that fails?
  4. DKIM checkIs a signing key published, and is it strong enough?
  5. SMTP checkDoes the mail server answer, encrypt and have reverse DNS?
  6. Blacklist checkIs the sending server on spam lists?
Routing

A network is unreachable from some places

  1. Announcement checkDo RPKI, the IRR and visibility all look right?
  2. Looking glassWhich paths do networks around the world take to it?
  3. TracerouteWhich networks does traffic cross from here?
  4. Registration lookupWho is the address space registered to?

Where the tests run

  • Our serverLookups and connections (SMTP, name servers) go only to public addresses, a few tests a minute per visitor.
  • Globalping probesDNS comparisons from other countries run on a free network of probes.

Built by PingOmni, makers of RadiusOne.