Compare two networks
The exchanges both are on, the ones only one is on, and the buildings both list in PeeringDB, where they could meet with a cross-connect.
Pick two networks.
Exchanges: PeeringDB and each exchange's own member lists (its IX-F export and the members list on its website); the badges say which list a network is on: PDB PeeringDB, IXF the IX-F export, WEB the website. Buildings: only what the networks list in PeeringDB, which no exchange or building confirms.