Bulk Host Migration Tester
Validate a DNS migration without touching DNS or your hosts file. Enter your hostnames and the IP of the new origin, and we open a real TLS connection to that IP while presenting each hostname as SNI — exactly what a hosts-file entry does. For every name you get the certificate the new origin actually serves, whether it covers that hostname, its issuer and expiry, the negotiated TLS version, and where the name points today. Paste a list or upload a CSV or TXT file with hundreds of entries.
About the Bulk Host Migration Tester
Validate a DNS migration without touching DNS or your hosts file. Enter your hostnames and the IP of the new origin, and we open a real TLS connection to that IP while presenting each hostname as SNI — exactly what a hosts-file entry does. For every name you get the certificate the new origin actually serves, whether it covers that hostname, its issuer and expiry, the negotiated TLS version, and where the name points today. Paste a list or upload a CSV or TXT file with hundreds of entries.
Queries run from our global edge network, so you see what a neutral observer on the public internet sees — not what your local network or ISP resolver happens to have cached.
Frequently asked questions
What does the Bulk Host Migration Tester do?
Validate a DNS migration without touching DNS or your hosts file. Enter your hostnames and the IP of the new origin, and we open a real TLS connection to that IP while presenting each hostname as SNI — exactly what a hosts-file entry does. For every name you get the certificate the new origin actually serves, whether it covers that hostname, its issuer and expiry, the negotiated TLS version, and where the name points today. Paste a list or upload a CSV or TXT file with hundreds of entries.
Is the Bulk Host Migration Tester free to use?
Yes. The Bulk Host Migration Tester is completely free with no account, no signup and no usage limits for normal use.
Do you log the lookups I run?
No. Queries are processed at the edge and returned straight to you. We do not retain, profile or sell your lookup history.