Keep an eye on the addresses you care about — a server, your home connection, a domain you depend on. The list is stored in this browser only: no account, no server-side storage, no email, and nothing to unsubscribe from.
Want to be told instead of having to look? Email alerts watch an address or a domain on the server and send one message when it changes. This page keeps everything in your browser and stores nothing; that one stores your address and the target, confirms it by mail first, and deletes both the moment you stop it.
Each entry keeps the country, city, network (ASN), organisation and reverse DNS we last saw. When you press Check all, every address is looked up again and any difference is highlighted. Geolocation moves more often than people expect: mobile carriers and VPN endpoints shift between cities as they renumber, and a hosting provider changing a prefix changes the ASN.
Email alerts would mean storing your address on the server and sending mail from it: accounts, double opt-in, a change-detection job and an unsubscribe flow. That is a real project rather than a checkbox, and it would sit badly next to a privacy policy that otherwise promises no stored history. Until then the check runs when you open this page, and the list can be exported and kept wherever you like.
The text below is the whole list. Copy it somewhere safe, or paste a previous copy back in.