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| Range | Name | Contact | |
| 172.16.22.0/24 | Empire House | Matthew Vernon | matthewv@chiark.greenend.org.uk |
| 172.16.23.0/24 | Empire House Wireless | Matthew Vernon | matthewv@chiark.greenend.org.uk |
| 172.16.148.0/24 | Xen Project test colo infra network | Xen Project infrastructure team | infra@xenproject.org |
| 172.17.0.0/16 | Docker default container network | Richard Kettlewell | hidden |
| 172.17.207.0/24 | anjou.terraraq.org.uk | Richard Kettlewell | hidden |
| 172.17.217.0/24 | Gallery wired subnet | Ben Harris | bjh21@bjh21.me.uk |
| 172.18.45.0/24 | Relativity | Ian Jackson | ijackson@chiark.greenend.org.uk |
| 172.18.46.0/24 | Relativity wifi | Ian Jackson | ijackson@chiark.greenend.org.uk |
| 172.18.47.240/28 | Relativity hippotat | Ian Jackson | ijackson@chiark.greenend.org.uk |
| 172.19.42.0/24 | daz.cat home | Delan Azabani | delan@azabani.com |
| 172.19.70.0/24 | funny computer sun net | Delan Azabani | delan@azabani.com |
| 172.19.92.0/24 | rrw house net | Richard Watts | rrw@semiramis.org.uk |
| 172.19.128.0/24 | daz.cat home | Delan Azabani | delan@azabani.com |
| 172.19.129.0/24 | daz.cat libvirt | Delan Azabani | delan@azabani.com |
| 172.19.242.0/24 | hemmel intermediate | Ian Jackson | ijackson@chiark.greenend.org.uk |
| 172.19.243.0/24 | house.hemmel.com | Ian Jackson | ijackson@chiark.greenend.org.uk |
| 172.20.0.0/24 | cambridge.dziewulski.com | Jan M. Dziewulski | hidden |
| 172.20.45.0/24 | virtual.impropriety.org.uk | Ross Younger | hidden |
| 172.20.78.96/27 | private wireguard | Ross Younger | hidden |
| 172.20.153.0/24 | rosewood.vpn.ucam.org | Colin Watson | cjwatson@chiark.greenend.org.uk |
| 172.20.154.0/24 | rosewood.vpn.ucam.org NAT64 pool | Colin Watson | cjwatson@chiark.greenend.org.uk |
| 172.20.170.0/28 | impropriety private tunnelling | Ross Younger | hidden |
| 172.20.242.192/27 | private vps tunnelling | Ross Younger | hidden |
| 172.21.21.0/24 | local.liyang.hu | Liyang HU | hidden |
| 172.21.80.0/24 | mantic.terraraq.uk | Richard Kettlewell | hidden |
| 172.21.92.0/24 | meanMachine N/w | Jose Mathew Manimala | hidden |
| 172.22.58.0/24 | Chesham Arms | Stephen Early | sde@individualpubs.co.uk |
| 172.22.178.0/24 | vegan.systems | Bram Dumolin | hidden |
| 172.22.198.0/24 | House of Atreus (wired) | James Aylett | hidden |
| 172.24.218.0/24 | House of Atreus (Mycenae) | James Aylett | hidden |
| 172.24.225.0/24 | House of Atreus (Tauris) | James Aylett | hidden |
| 172.24.230.192/28 | hippotat (ip-over-http) default | Ian Jackson | ijackson@chiark.greenend.org.uk |
| 172.25.0.0/16 | banana.intern | Bram Dumolin | hidden |
| 172.25.192.224/28 | Empire House printer | Matthew Vernon | matthewv@chiark.greenend.org.uk |
| 172.26.64.0/24 | Individual Pubs Limited public access wireless | Stephen Early | sde@individualpubs.co.uk |
| 172.26.65.0/24 | Individual Pubs Limited private wireless | Stephen Early | sde@individualpubs.co.uk |
| 172.26.66.0/24 | Individual Pubs Limited managers flats | Stephen Early | sde@individualpubs.co.uk |
| 172.26.204.0/22 | IPL Internet of Things | Stephen Early | sde@individualpubs.co.uk |
| 172.27.134.0/24 | Gallery wireless subnet | Ben Harris | bjh21@bjh21.me.uk |
| 172.28.3.0/24 | troposphere.internal | Jacob Nevins | hidden |
| 172.28.82.0/24 | archaic wifi | Peter Maydell | hidden |
| 172.28.83.0/24 | archaic wired | Peter Maydell | hidden |
| 172.28.84.0/24 | archaic printer vlan | Peter Maydell | hidden |
| 172.28.85.0/24 | archaic misc | Peter Maydell | hidden |
| 172.28.144.0/24 | MJW house network | Matthew Woodcraft | matthew@woodcraft.me.uk |
| 172.28.254.0/24 | IPL backup connections | Stephen Early | sde@individualpubs.co.uk |
| 172.29.85.0/24 | Andrew's house | Andrew Kanaber | hidden |
| 172.29.143.0/24 | sinister NAT64 pool | Stephen Early | steve@assorted.org.uk |
| 172.29.196.0/22 | distorted.org.uk | Mark Wooding | mdw@distorted.org.uk |
| 172.30.52.0/22 | Individual Pubs Limited | Stephen Early | sde@individualpubs.co.uk |
| 172.30.138.0/24 | vipulagarwal | Vipul Agarwal | hidden |
| 172.31.1.0/24 | anjou-test-araminta | Richard Kettlewell | hidden |
| 172.31.59.0/24 | wlan.anjou.terraraq.org.uk | Richard Kettlewell | hidden |
| 172.31.79.0/24 | chiark ip-over-http | Ian Jackson | ijackson@chiark.greenend.org.uk |
| 172.31.80.0/24 | chiark users' small vpn subnets | Ian Jackson | ijackson@chiark.greenend.org.uk |
| 172.31.81.0/24 | chiark hub | Ian Jackson | ijackson@chiark.greenend.org.uk |
| 172.31.144.0/24 | MJW house network 2 | Matthew Woodcraft | matthew@woodcraft.me.uk |
| 172.31.172.0/24 | EMF private till network | Stephen Early | steve@emfcamp.org |