If you want to see the IP addresses from which logins have occurred on a Linux or OS X system, you can use the last command. E.g.:
$ last ann ann tty2 Thu Jan 5 20:23 - 20:27 (00:03) ann tty2 Thu Jan 5 20:05 - 20:06 (00:00) ann tty2 Thu Jan 5 20:01 - 20:02 (00:00) ann pts/0 8.25.222.2 Sun Oct 30 10:43 - 16:59 (06:16) ann pts/0 192.168.0.2 Tue Oct 11 12:02 - 12:03 (00:00) ann pts/0 192.168.0.2 Tue Oct 11 12:01 - 12:01 (00:00) ann pts/32 192.168.1.6 Sat Jun 11 20:03 - 20:38 (00:35) ann pts/32 192.168.1.6 Sat Jun 11 13:23 - 14:22 (00:58) ann pts/14 192.168.1.5 Sun Feb 14 17:05 - 18:28 (6+01:22) ann pts/6 8.23.51.9 Sun Nov 8 09:23 - 10:16 (00:52) ann pts/6 8.23.51.9 Sat Nov 7 08:54 - 16:42 (07:48) ann pts/7 8.23.51.9 Fri Nov 6 16:47 - 16:49 (00:02) ann pts/6 8.23.51.9 Fri Nov 6 15:48 - 23:33 (07:44) ann pts/0 :0 Thu Sep 10 15:25 - 12:38 (129+22:13) ann :0 :0 Thu Sep 10 15:24 - 12:38 (129+22:14) ann pts/5 :0 Sun Aug 23 11:08 - crash (18+04:03) ann pts/4 :0 Sat Aug 22 21:16 - crash (18+17:56) ann pts/3 :0 Sat Aug 22 09:14 - crash (19+05:58) ann :0 :0 Sat Aug 22 09:07 - crash (19+06:05) ann pts/2 192.168.1.6 Sun Jul 19 15:41 - 20:59 (1+05:18) ann pts/2 192.168.1.5 Mon Jun 22 21:28 - 20:17 (18+22:49) ann pts/2 192.168.1.6 Fri Feb 6 21:26 - 21:26 (00:00) ann pts/5 192.168.0.3 Wed Nov 5 21:07 - 22:15 (01:08) wtmp begins Sun Oct 5 20:09:11 2014 $
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