Rich Felker@astraleureka @bagder Guess of mechanism: after resolving as a numeric address (rightly) fails with the standard processing, it gets passed on to next NSS backend in the order. Systemd (or something) has provided one which also resolves aaa.bbb.ccc.ddd (but not just aaaaaaaaaaaa form) to numeric IPv4, but forcibly treats all fields as decimal contrary to the RFC and POSIX. Hilarity ensues.
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