Reverse DNS Lookup
Query the PTR record for an address to find the hostname its operator has registered. Mail servers check this, which makes it a required step when diagnosing delivery problems.
- Limits No file upload · Up to 2,000 runs a day
- Where it runs Runs on our server; no file is uploaded.
- Cost Free, with the limits above. No account needed.
Where to find it
Every address below opens the same tool. The first address is the one to bookmark and share.
- rdns.openvibe.toolsPrimary
People also call this
What it's for: Run a reverse DNS lookup to find the PTR hostname for any IPv4 or IPv6 address. Essential for mail server checks. Instant.
What trips people up: Why does my mail get rejected for missing reverse DNS? Receiving mail servers treat a missing or mismatched PTR record as a spam signal. Your hosting provider sets this record for you.
- reverse dns lookup
- ptr record lookup
- rdns
- ip to hostname
- reverse ip lookup
Use it from code
POST https://openvibe.tools/api/v1/tools/rdns/run- No account needed: anonymous calls run on the lowest quota tier; a token with
tools.tool.runraises it. - It answers with the result.
curl -X POST https://openvibe.tools/api/v1/tools/rdns/run \
-H 'Content-Type: application/json' \
-d '{"input":{"target":"example.com"}}'Inputs: JSON Schema · OpenAPI · from JavaScript: tools.run("rdns", …) in openvibe-sdk · How the API works
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