Currently, the canonicalization logic for some host addresses gets different results in java and python (the current c# version has the same results as python, but the ticket is still not finished).

To check it, I used python code which is provided in the description of spec ticket: SPEC-1040 and the following java code:

InetAddress.getByName(serverAddress.getHost()).getCanonicalHostName()

from https://github.com/mongodb/mongo-java-driver/blob/master/driver-core/src/main/com/mongodb/internal/connection/GSSAPIAuthenticator.java#L98

See, this google doc with the results: https://docs.google.com/document/d/145oeuIYo-2OMmZC8P68LaPI_RfSuaQw3buC_yKB9qb0.
In two words, the canonicalization logic for the host azure.microsoft.com returns different results for java and python:

• Python result: l-0007.l-msedge.net
• Java result: 13.107.42.16

The target of this ticket is to determine which result is correct/expected. Also, it would be great to add more test hostnames to check this behavior.