uk_parl_wikipedia.txt

The houses of parliament netblock is publicly listed:

https://apps.db.ripe.net/search/lookup.html?source=ripe&key=194.60.0.0%20-%20194.60.63.255&type=inetnum

Despite their unwillingness to reveal the UK parliament web proxies in an FOI
request, wikipedia allows you to query for /24 blocks. 63 wikipedia queries
later, and here's the list of every IP address that has made a wikipedia edit
from the UK parliament netblock.

194.60.62.36 7 found
194.60.62.35 10 found
194.60.62.34 15 found
194.60.62.33 34 found
194.60.62.32 7 found
194.60.62.31 12 found
194.60.62.29 22 found
194.60.38.29 8 found
194.60.38.28 26 found
194.60.38.27 8 found
194.60.38.26 17 found
194.60.38.25 2 found
194.60.38.24 1 found
194.60.38.205 15 found
194.60.38.204 10 found
194.60.38.203 19 found
194.60.38.202 22 found
194.60.38.201 6 found
194.60.38.200 3 found
194.60.38.20 1 found
194.60.38.198 2264 found
194.60.38.11 14 found
194.60.38.10 3655 found

Guess which ones the proxies are (Its not the high numbers, they're the old ones)

For an encore, here's the Prime Ministers office:

194.201.189.162 11 found

And for my final trick, the Government Secure Intranet proxies:

62.25.109.196 2388 found (gateway-103.energis.gsi.gov.uk)
195.92.40.49 7977 found (gateway-202.energis.gsi.gov.uk)
62.25.109.194 4316 found (gateway-301.energis.gsi.gov.uk)
62.25.109.196 2388 found (gateway-303.energis.gsi.gov.uk)
195.92.206.244 17 found (gateway-403.energis.gsi.gov.uk)
195.92.206.243 92 found (gateway-402.energis.gsi.gov.uk)

Many thanks to @russss, who did a lot of the GSI digging.