Command: sudo iwlist wlan0 scan

Output:

wlan0     Scan completed :

	Cell 01 - Address: 6C:F3:7F:E8:7E:40
                    ESSID:"PCC-WiFi"
                    Protocol:IEEE 802.11bgn
                    Mode:Master
                    Frequency:2.412 GHz (Channel 1)
                    Encryption key:on
                    Bit Rates:144 Mb/s
                    Extra:rsn_ie=30140100000fac040100000fac040100000fac012800
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : CCMP
                        Pairwise Ciphers (1) : CCMP
                        Authentication Suites (1) : 802.1x
                    Quality=95/100  Signal level=42/100

	Cell 02 - Address: D8:C7:C8:86:AF:00
                    ESSID:"PCC-WiFi"
                    Protocol:IEEE 802.11bgn
                    Mode:Master
                    Frequency:2.437 GHz (Channel 6)
                    Encryption key:on
                    Bit Rates:144 Mb/s
                    Extra:rsn_ie=30140100000fac040100000fac040100000fac012800
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : CCMP
                        Pairwise Ciphers (1) : CCMP
                        Authentication Suites (1) : 802.1x
                    Quality=96/100  Signal level=54/100

	Cell 03 - Address: D8:C7:C8:86:4A:A2
                    ESSID:"PCC-WiFi"
                    Protocol:IEEE 802.11bgn
                    Mode:Master
                    Frequency:2.462 GHz (Channel 11)
                    Encryption key:on
                    Bit Rates:144 Mb/s
                    Extra:rsn_ie=30140100000fac040100000fac040100000fac012800
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : CCMP
                        Pairwise Ciphers (1) : CCMP
                        Authentication Suites (1) : 802.1x
                    Quality=96/100  Signal level=75/100

	Cell 04 - Address: C8:D7:19:74:AD:7A
                    ESSID:"Cisco40840"
                    Protocol:IEEE 802.11bgn
                    Mode:Master
                    Frequency:2.462 GHz (Channel 11)
                    Encryption key:off
                    Bit Rates:144 Mb/s
                    IE: Unknown: DD740050F204104A0001101044000101103B00010310470010235CBE8C72A7121D3B4973E19CC4C30D102100074C696E6B73797310230004453930301024000776312E302E30301042000234321054000800060050F20400011011000445393030100800022688103C0001011049000600372A000120
                    Quality=91/100  Signal level=43/100

          Cell 05 - Address: D8:C7:C8:86:24:82
                    ESSID:"PCC-WiFi"
                    Protocol:IEEE 802.11bgn
                    Mode:Master
                    Frequency:2.412 GHz (Channel 1)
                    Encryption key:on
                    Bit Rates:144 Mb/s
                    Extra:rsn_ie=30140100000fac040100000fac040100000fac012800
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : CCMP
                        Pairwise Ciphers (1) : CCMP
                        Authentication Suites (1) : 802.1x
                    Quality=54/100  Signal level=39/100

          Cell 06 - Address: D8:C7:C8:86:4A:22
                    ESSID:"PCC-WiFi"
                    Protocol:IEEE 802.11bgn
                    Mode:Master
                    Frequency:2.437 GHz (Channel 6)
                    Encryption key:on
                    Bit Rates:144 Mb/s
                    Extra:rsn_ie=30140100000fac040100000fac040100000fac012800
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : CCMP
                        Pairwise Ciphers (1) : CCMP
                        Authentication Suites (1) : 802.1x
                    Quality=71/100  Signal level=36/100

          Cell 07 - Address: D8:C7:C8:86:2B:62
                    ESSID:"PCC-WiFi"
                    Protocol:IEEE 802.11bgn
                    Mode:Master
                    Frequency:2.462 GHz (Channel 11)
                    Encryption key:on
                    Bit Rates:144 Mb/s
                    Extra:rsn_ie=30140100000fac040100000fac040100000fac012800
                    IE: IEEE 802.11i/WPA2 Version 1
                        Group Cipher : CCMP
                        Pairwise Ciphers (1) : CCMP
                        Authentication Suites (1) : 802.1x
                    Quality=20/100  Signal level=7/100