this is why some ISPs use a format that maps to two letter country code, then state or subdivision, then POP. where 01 is the first pop in the city, 02 is second, etc. The ISP's own internal documentation system will tell their NOC and neteng staff which pop number is which street address/datacenter (info that does not need to be available in rDNS). in a totally random example, nyc01 POP for an ISP might be 25 broadway, nyc02 would be 60 hudson, nyc03 would be 111 8th, and so on.
example agg router:
agg1.nyc01.ny.us.ASNUMBER.net
and then individual interfaces and subinterfaces would be defined under hierarchically under agg1.
For example one can determine that EGLL is in Western Europe, UK without having to look up tables to determine that it is Heathrow.