IPv4
—ms
total time
- DNS
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- TCP
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- TLS
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- TTFB
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Address probes
Run a comparison to see address probes.
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Result
No comparison yet
Results appear here after the first comparison.
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IPv6
—ms
total time
- DNS
- —
- TCP
- —
- TLS
- —
- TTFB
- —
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Address probes
Run a comparison to see address probes.
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Product detail
Find whether IPv4 or IPv6 is the reason a site is slow or unreachable.
IP Check is a public IPv4 and IPv6 reachability checker for domains and HTTPS URLs. It resolves A and AAAA records separately, tests both network paths from the same server, and shows where DNS, TCP, TLS, or first-byte timing starts to diverge.
The output is meant for operators who need a quick second opinion before changing DNS, debugging CDN behavior, checking IPv6 rollout, or confirming that a certificate and origin respond consistently on both address families.
Compare both address families
Run the same domain over IPv4 and IPv6 and see which path is reachable, faster, or failing.
Separate DNS from connection issues
Spot missing A or AAAA records, slow resolution, and failures that happen before a socket opens.
Verify HTTPS handshakes
Check whether TCP connects but TLS stalls, fails, or behaves differently on one network path.
Compare first-byte timing
Use the timing breakdown to separate a slow DNS lookup from a slow connect, TLS handshake, or origin response.
FAQ
IPv4 and IPv6 testing questions
What does IP Check test?
IP Check tests public domains and HTTPS URLs over IPv4 and IPv6 from the same external server. It separates DNS lookup, TCP connection, TLS handshake, and time to first byte so operators can see where one address family is slower or unreachable.
Can it confirm whether IPv6 works?
Yes. Enter a public hostname or HTTPS URL and the result shows whether AAAA records resolve, whether the IPv6 address connects, whether TLS succeeds, and how the timing compares with IPv4.
Which API endpoints are available?
The /ip endpoint returns the detected public IP address as plain text. The /details endpoint returns JSON with the detected IP version plus location and network fields when local DB-IP Lite data is available.
Does IP Check store analytics or tracking cookies?
No. The public interface does not use accounts, analytics, or tracking cookies. Checks are rate-limited for service protection, and private or local network targets are blocked by the backend.