txidtest.dns-oarc.net -- Check your resolver's transaction ID behavior

2023-06-01: This service has been deprecated in favor of Check My DNS.

A number of people have been asking for a way to check transaction ID randomness, in addition to source port randomness. OARC's porttest tool has now been expanded to also report on transaction IDs. To use it, issue a TXT query for the name txidtest.dns-oarc.net. For example, with dig: