# @kazani: Mullvad VPN exit IPs are predictable and create linkable fingerprints

Source: https://farcaster.xyz/kazani/0x4e7ddc94
Kiwi News: https://news.kiwistand.com/stories/kazani-Mullvad-VPN-exit-IPs-are-predictable-and-create-linkable-fingerprints?index=0x6a06e04ca281788a45aeb761b7c2697d3b9066f283c1b0fa2cb598ebbb894c7310e70f08
Submitted by @kazani on 2026-05-15 UTC, 2 upvotes, 0 comments

## Summary

Mullvad VPN assigns exit IP addresses through a fixed, predictable formula based on a user's WireGuard connection key rather than picking them randomly on each connection, according to a post by @kazani. The post says a quirk in the random number generator makes the IPs across different servers follow very similar patterns. The researcher reportedly tested thousands of keys and found only 284 unique IP combinations, which could allow different connections or accounts to be linked together as a fingerprint.

## Article

Mullvad VPN doesn't pick your outgoing (exit) IP address randomly every time you connect. Instead, it uses a fixed, predictable math formula based on your WireGuard connection key

Because of a quirk in how their random number generator works, the IPs you get on different servers always follow very similar patterns

The researcher tested thousands of keys and found only 284 unique IP combinations reeee - creates an easy "fingerprint" that can link your different connections or accounts together

https://tmctmt.com/posts/mullvad-exit-ips-as-a-fingerprinting-vector/