Abra um terminal CTRL + ALT + T e digite o seguinte comando
sudo iwlist scan
Isso listará todos os sinais Wifi que o seu PC pode ver, conforme mostrado abaixo.
warren@dell:~$ sudo iwlist scan
[sudo] password for warren:
lo Interface doesn't support scanning.
wlan0 Scan completed :
Cell 01 - Address: 4C:60:DE:6B:85:4A
Channel:36
Frequency:5.18 GHz (Channel 36)
Quality=57/70 Signal level=-53 dBm
Encryption key:on
ESSID:"HS-1gid46vaylveagu59b3ks232h"
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=0000057e902c95aa
Extra: Last beacon: 3580ms ago
IE: Unknown: 001C48532D3167696434367661796C7665616775353962336B7332333268
IE: Unknown: 01088C129824B048606C
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : CCMP TKIP
Authentication Suites (1) : PSK
IE: Unknown: 2D1A6E081BFFFF000001000000000000000000000000000000000000
IE: Unknown: 3D16240D0400000000000000000000000000000000000000
IE: Unknown: DD730050F204104A00011010440001021041000100103B00010310470010C8F7D19B3C39E65DD5B3EC2A8601640D102100074E6574676561721023000844474E44333330301024000631323334353610420004313233341054000800060050F20400011011000844474E4433333030100800020088
IE: Unknown: DD090010180201F0050000
IE: WPA Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : CCMP TKIP
Authentication Suites (1) : PSK
IE: Unknown: DD180050F2020101800003A4000027A4000042435E0062322F00
IE: Unknown: DD1E00904C336E081BFFFF000001000000000000000000000000000000000000
IE: Unknown: DD1A00904C34240D0400000000000000000000000000000000000000
Cell 02 - Address: 1C:AF:F7:63:A5:26
Channel:1
Frequency:2.412 GHz (Channel 1)
Quality=36/70 Signal level=-74 dBm
Encryption key:on
ESSID:"TALKTALK-63A526"
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=00000014c7e111bc
Extra: Last beacon: 4444ms ago
IE: Unknown: 000F54414C4B54414C4B2D363341353236
IE: Unknown: 010882848B960C121824
IE: Unknown: 030101
IE: Unknown: 2A0104
IE: Unknown: 32043048606C
IE: WPA Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : TKIP CCMP
Authentication Suites (1) : PSK
IE: IEEE 802.11i/WPA2 Version 1
Group Cipher : TKIP
Pairwise Ciphers (2) : TKIP CCMP
Authentication Suites (1) : PSK
IE: Unknown: DD180050F2020101000003A4000027A4000042435E0062322F00