What is a BSSID? Wi-Fi Network Identifiers Explained

If you're getting into wardriving or Wi-Fi research, you'll run into several identifiers quickly: SSID, BSSID, MAC address. They're related but distinct, and confusing them leads to misreading logs and tools.

SSID — the network name

SSID stands for Service Set Identifier. It's the human-readable name of a Wi-Fi network — the name you see when you scan for networks on your phone. "HomeNetwork_5G", "CafeWiFi", "DIRECT-ABC123" are all SSIDs.

Key things to know:

• Multiple access points can share the same SSID (this is how mesh networks and enterprise setups work)
• SSIDs can be hidden — the AP doesn't broadcast the name, but the AP itself is still detectable
• SSIDs are set by the network owner and can be anything up to 32 characters

BSSID — the access point hardware address

BSSID stands for Basic Service Set Identifier. It uniquely identifies a specific access point (radio) — not the network name, but the physical hardware itself.

In practice, a BSSID is the MAC address of the AP's wireless radio interface. A MAC address is a 12-character hexadecimal value like AA:BB:CC:DD:EE:FF, assigned to network hardware at manufacture.

Key things to know:

• Every physical AP has a unique BSSID
• A single router with dual-band radios has two BSSIDs — one for 2.4GHz and one for 5GHz
• Mesh nodes each have their own BSSID, even if they share an SSID
• The BSSID is what wardriving and WiGLE scoring is based on — not the SSID

Why wardriving uses BSSID, not SSID

Wardriving competitions like wdgwars score on unique BSSIDs, not unique SSIDs. This is intentional.

If scoring used SSID, every network named "Linksys" would count as the same discovery. BSSID scoring means every physical access point is a unique discovery, regardless of what name it broadcasts. This accurately reflects geographic network density.

MAC address vs BSSID

They're the same value. The BSSID of a Wi-Fi access point is its wireless interface MAC address. The term "BSSID" is used in the context of 802.11 Wi-Fi protocol; "MAC address" is the more general networking term.

Some devices use MAC address randomization — phones and laptops sometimes broadcast randomized MAC addresses as client devices to prevent tracking. This affects client-side privacy but doesn't change AP BSSIDs.

ESSID — the extended version

ESSID (Extended Service Set Identifier) is effectively the same as SSID in common usage. The "extended" refers to the fact that multiple APs can form one logical network (the Extended Service Set) under one name. You'll see ESSID in older tools and documentation — treat it as equivalent to SSID.

Practical example

Suppose you wardrive past a house with a dual-band mesh router:

• SSID: "SmithHome"
• BSSID 1: A4:11:62:BC:DE:01 (2.4GHz radio, main node)
• BSSID 2: A4:11:62:BC:DE:02 (5GHz radio, main node)
• BSSID 3: A4:11:62:BC:DE:03 (2.4GHz radio, satellite node)
• BSSID 4: A4:11:62:BC:DE:04 (5GHz radio, satellite node)

All four BSSIDs share the same SSID. Your wardriving log captures all four as separate entries — four unique network discoveries, one household.

This is why dual-band wardriving hardware like the SigBin Drive and SigBin Pro captures more unique BSSIDs than single-band hardware — they see both radios at every access point.