Up to now we 've been using 192.168/16 IPs for kubernetes in production. That was fine during the initial phases but we should migrate to a better scheme and assign IPs in the 10/8 space. Also we should assign IPv6 addresses and we should do this for all 3 clusters (eqiad, codfw and staging).
An interesting question is what we should end up doing with Service IPs. Service IPs are never seen on the network (on the physical wire) due to the various NATs so we could use whatever we want. However, it might make sense to have an assignment documented so at least it's easy to look up the used IPs.