Someone

iurgi@oka:~$ sudo iwlist eth1 scan|grep "A2:47:2" -A10
          Cell 19 - Address: 00:18:84:A2:47:2D
                    ESSID:"FON_AP"
                    Protocol:IEEE 802.11bg
                    Mode:Master
                    Channel:11
                    Frequency:2.462 GHz (Channel 11)
                    Encryption key:off
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
                              9 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
                              48 Mb/s; 54 Mb/s
                    Quality=97/100  Signal level=-28 dBm  Noise level=-28 dBm
--
          Cell 20 - Address: 00:18:84:A2:47:2E
                    ESSID:"iurgi"
                    Protocol:IEEE 802.11bg
                    Mode:Master
                    Channel:11
                    Frequency:2.462 GHz (Channel 11)
                    Encryption key:on
                    Bit Rates:1 Mb/s; 2 Mb/s; 5.5 Mb/s; 11 Mb/s; 6 Mb/s
                              9 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s; 36 Mb/s
                              48 Mb/s; 54 Mb/s
                    Quality=100/100  Signal level=-17 dBm  Noise level=-17 dBm