Reddit's detection is more about behavioral linking than hard IP limits. That said, running more than 2-3 accounts from one IP is risky, especially if they interact with each other.
The specific patterns that trigger admin action:
- Multiple accounts from the same IP voting on the same posts (vote manipulation is their #1 concern)
- Same IP replying in the same thread from different accounts
- Cross-posting identical or near-identical content from accounts sharing an IP
Key factors Reddit considers beyond just IP:
- Account age and karma — older accounts with history get more leeway before triggering checks
- Browser/device fingerprint — if accounts share the same cookie store, user-agent, and canvas fingerprint, that's as linkable as a shared IP
- Posting patterns — timing overlap between accounts from the same IP is a signal
Practically: 1 dedicated proxy per account is the safe setup. Pair that with isolated browser profiles (different user-agent, cookie store, canvas fingerprint per account). The IP is just one of several linking vectors Reddit uses.
Also worth knowing: Reddit's shadowban is completely silent. You can post normally and nobody sees it. Worth checking accounts occasionally from a fresh incognito session to confirm they're still visible publicly.