Scan wireless networks.
Use iwlist
utility to scan wireless networks.
$ sudo iwlist wlan0 scanning
wlan0 Scan completed : Cell 01 - Address: 00:78:CD:91:BA:30 Channel:6 Frequency:2.437 GHz (Channel 6) Quality=70/70 Signal level=-20 dBm Encryption key:on ESSID:"Searching..." 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 Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s Mode:Master Extra:tsf=0000000000000000 Extra: Last beacon: 16ms ago IE: Unknown: 000C536561726368696E672E2E2E IE: Unknown: 010882848B960C121824 IE: Unknown: 030106 IE: Unknown: 050400010000 IE: Unknown: 0706504C20010D14 IE: Unknown: 2A0100 IE: Unknown: 32043048606C IE: Unknown: 460573D000000C IE: Unknown: 2D1AAC011BFFFFFF0000000000000000000100000000000000000000 IE: Unknown: 3D1606000500000000000000000000000000000000000000 IE: Unknown: 7F0800000F0200000040 IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00 IE: Unknown: DD0900037F01010000FF7F IE: IEEE 802.11i/WPA2 Version 1 Group Cipher : CCMP Pairwise Ciphers (1) : CCMP Authentication Suites (1) : PSK [...] Cell 05 - Address: 00:78:CD:14:C7:DA Channel:11 Frequency:2.462 GHz (Channel 11) Quality=66/70 Signal level=-44 dBm Encryption key:off ESSID:"" 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 Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s Mode:Master Extra:tsf=0000000000000000 Extra: Last beacon: 16ms ago IE: Unknown: 0000 IE: Unknown: 010882848B960C121824 IE: Unknown: 03010B IE: Unknown: 050400010000 IE: Unknown: 0706504C20010D14 IE: Unknown: 2A0100 IE: Unknown: 32043048606C IE: Unknown: 2D1A2D011BFF000000000000000000000001000000000406E6070C00 IE: Unknown: 3D160B080000000000000000000000000000000000000000 IE: Unknown: 7F080000000000000040 IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00 IE: Unknown: DD0900037F01010000FF7F [...] Cell 09 - Address: 00:78:CD:F1:B3:EB Channel:52 Frequency:5.26 GHz (Channel 52) Quality=70/70 Signal level=-32 dBm Encryption key:on ESSID:"Hidding..." Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s 36 Mb/s; 48 Mb/s; 54 Mb/s Mode:Master Extra:tsf=0000000000000000 Extra: Last beacon: 16ms ago IE: Unknown: 00115769746F6C6420476F6D62726F7769637A IE: Unknown: 01088C129824B048606C IE: Unknown: 030134 IE: Unknown: 073C504C202401142801142C01143001143401143801143C011440011464011B68011B6C011B70011B74011B78011B7C011B80011B84011B88011B8C011B IE: Unknown: 200103 IE: Unknown: 460573D000000C IE: Unknown: 2D1AEF0903FFFFFFFF00000000000000000100000000000000000000 IE: Unknown: 3D1634050000000000000000000000000000000000000000 IE: Unknown: 7F0800000F0200000040 IE: Unknown: BF0CF2618033AAFF0000AAFF0000 IE: Unknown: C005013A00FCFF IE: Unknown: C30503D8D8D8D8 IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00 IE: Unknown: DD0900037F01010000FF7F IE: IEEE 802.11i/WPA2 Version 1 Group Cipher : CCMP Pairwise Ciphers (1) : CCMP Authentication Suites (1) : PSK [...] Cell 12 - Address: 06:78:CD:21:BA:3E Channel:6 Frequency:2.437 GHz (Channel 6) Quality=70/70 Signal level=-20 dBm 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 Bit Rates:24 Mb/s; 36 Mb/s; 48 Mb/s; 54 Mb/s Extra:Mesh Network Path Selection Protocol ID: 0x01 Extra:Path Selection Metric ID: 0x01 Extra:Congestion Control Mode ID: 0x00 Extra:Synchronization ID: 0x01 Extra:Authentication ID: 0x00 Extra:Formation Info: 0x00 Extra:Capabilities: 0x09 ESSID:"I7GrvBkvJjjd55kf" Mode:Unknown/bug Extra:tsf=0000000000000000 Extra: Last beacon: 16ms ago IE: Unknown: 010882848B960C121824 IE: Unknown: 030106 IE: Unknown: 050400010000 IE: Unknown: 0706504C20010D14 IE: Unknown: 2A0100 IE: Unknown: 32043048606C IE: Unknown: 2D1AAC011BFFFFFF0000000000000000000100000000000000000000 IE: Unknown: 3D1606000500000000000000000000000000000000000000 IE: Unknown: 7F080000000000000040 IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00 IE: Unknown: DD0900037F01010000FF7F IE: Unknown: 710701010001000009 IE: Unknown: 72104937477276426B764A6A6A6435356B66 [...] Cell 15 - Address: 06:78:CD:0E:B2:30 Channel:52 Frequency:5.26 GHz (Channel 52) Quality=70/70 Signal level=-32 dBm Encryption key:on ESSID:"" Bit Rates:6 Mb/s; 9 Mb/s; 12 Mb/s; 18 Mb/s; 24 Mb/s 36 Mb/s; 48 Mb/s; 54 Mb/s Mode:Master Extra:tsf=0000000000000000 Extra: Last beacon: 16ms ago IE: Unknown: 0000 IE: Unknown: 01088C129824B048606C IE: Unknown: 030134 IE: Unknown: 050400010000 IE: Unknown: 073C504C202401142801142C01143001143401143801143C011440011464011B68011B6C011B70011B74011B78011B7C011B80011B84011B88011B8C011B IE: Unknown: 200103 IE: Unknown: 460573D000000C IE: Unknown: 2D1AEF0903FFFFFFFF00000000000000000100000000000000000000 IE: Unknown: 3D1634050000000000000000000000000000000000000000 IE: Unknown: 7F0800000F0200000040 IE: Unknown: BF0CF2798333AAFF0000AAFF0000 IE: Unknown: C005013A00FCFF IE: Unknown: C30503D8D8D8D8 IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00 IE: Unknown: DD0900037F01010000FF7F IE: IEEE 802.11i/WPA2 Version 1 Group Cipher : CCMP Pairwise Ciphers (1) : CCMP Authentication Suites (1) : PSK IE: Unknown: DD0B8CFDF00000000300000000 IE: Unknown: DD178CFDF0000100104937477276426B764A6A6A6435356B66
Use grep
to extract specific information.
$ sudo iwlist wlan0 scanning | grep -e Cell -e Frequency -e Quality -e ESSID
Cell 01 - Address: 00:78:CD:91:BA:30 Frequency:2.437 GHz (Channel 6) Quality=70/70 Signal level=-20 dBm ESSID:"Searching..." Cell 02 - Address: 06:78:CD:21:BA:3E Frequency:2.437 GHz (Channel 6) Quality=39/70 Signal level=-71 dBm ESSID:"I7GrvBkvJjjd55kf" [...] Cell 04 - Address: 00:78:CD:14:C7:DA Frequency:2.462 GHz (Channel 11) Quality=64/70 Signal level=-46 dBm ESSID:"" [...] Cell 12 - Address: 00:78:CD:F1:B3:EB Frequency:5.26 GHz (Channel 52) Quality=70/70 Signal level=-32 dBm ESSID:"Hidding..." [...] Cell 18 - Address: 06:78:CD:0E:B2:30 Frequency:5.26 GHz (Channel 52) Quality=70/70 Signal level=-32 dBm ESSID:""
Simple as that.