barjavel.freenode.net and hitchcock.freenode.net (server that doesn't support ipv6)

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/server barjavel.freenode.net

* Looking up barjavel.freenode.net
* Connecting to barjavel.freenode.net (78.40.125.4) port 6667...
* Connected. Now logging in...
* *** Looking up your hostname...
* *** Checking Ident
* *** Couldn't look up your hostname
* *** No Ident response
...etc
...etc

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/server hitchcock.freenode.net

* Looking up hitchcock.freenode.net
* Connecting to hitchcock.freenode.net (93.152.160.101) port 6667...
* Connected. Now logging in...
* *** Looking up your hostname...
* *** Checking Ident
* *** Couldn't look up your hostname
...etc
...etc

=================================================
adams.freenode.net and calvino.freenode.net (support ipv6)

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/server adams.freenode.net

* Looking up adams.freenode.net
* Connecting to adams.freenode.net (2a01:270:0:666f::1) port 6667...
* Connection failed. Error: Network is unreachable

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/server calvino.freenode.net

* Looking up calvino.freenode.net
* Connecting to calvino.freenode.net (2001:1418:13:1::25) port 6667...
* Connection failed. Error: Network is unreachable