Article19 Anonymity is less discussed topic in the IETF than for instance security [RFC3552] or privacy [RFC6973]. This can be attributed to the fact anonymity is a hard technical problem or that anonymizing user data is not of specific market interest. It remains a fact that 'most internet users would like to be anonymous online at least occasionally' [Pew]. This document aims to break down the different meanings and implications of anonymity on a mediated computer network.