As @sea_monster mentioned, IP addresses aren't stored as a part of the protocol, but they can be collected by relays and clients on the network if they desire.
Never too late to take steps to protect your privacy :)
are there any clients or relays that use Tor/I2P or other ways of communicating without IP ?
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None right now that I'm aware of, though you can use the web apps like iris.to or nostr.social in Tor browser.
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