About Peer Overlap
Peer Overlap · last updated 17 July 2026
Peer Overlap is a free tool for comparing networks, internet exchanges, and interconnection facilities from PeeringDB, the public database the internet-interconnection community maintains. It's built to answer questions like "where do these two networks already meet?" and "what would I gain by adding this facility?"
An independent, unofficial project
Peer Overlap is not affiliated with or endorsed by PeeringDB. All the network, exchange, and facility data it shows comes from PeeringDB's public API and remains subject to PeeringDB's own policies; every screen carries that attribution in its footer.
What you can do with it
- Compare networks (ASNs) — pick two networks and see the exchange points and facilities they already have in common, grouped by region, so you can see where they overlap at a glance.
- Compare facilities — pick up to five data-center facilities and see which networks and exchanges are present at each, and which are unique to one site. Useful for "what do I gain at this location that I don't already have?"
- Compare exchanges — the mirror image: pick up to five internet exchanges and compare the facilities that host them and the networks that peer at each. Works as a quick single-exchange lookup too.
- Shareable links — every comparison lives in the page address, so sending someone the link reproduces your exact query. The link holds only public IDs and which view you were on — nothing about you.
- Type-ahead search — type words in any order to find a network by name, nickname, or AS number, or a facility by name, address, or city. No exact spelling or punctuation required.
How it uses PeeringDB — read-only and polite
PeeringDB is a shared community resource, and Peer Overlap is built to be a good citizen of it. Access is read-only and anonymous — the app only ever looks data up, never changes anything.
To avoid hammering PeeringDB, answers are cached and shared: every visitor rides one common cache rather than each person's searches generating fresh traffic, and requests are paced so a single action can't burst. The result is that Peer Overlap's load on PeeringDB stays modest no matter how many people use it.
Privacy
There are no accounts, no ads, no analytics, and no third-party trackers of any kind. Sign-in is currently switched off entirely, so the app never receives your name, email, or PeeringDB profile. Your searches do pass through our own server (that's how the shared cache works), so the full story is worth reading — see the privacy notice.
Accessibility
The app is built to be usable with a keyboard and a screen reader: every control is reachable and labelled, the comparison tables announce real "present at / not present at" information rather than bare symbols, and text colours are checked against WCAG AA contrast standards rather than eyeballed.
Who made it
Peer Overlap is an independent project by Patrick Matthies, and it's free to use. The PeeringDB data it displays is governed by PeeringDB's Acceptable Use Policy (non-commercial use).