You can get details about an existing entry by selecting it from this list; this can also be used to modify it.
| Range | Name | Contact | |
| 10.0.0.0/12 | OxIRC CIPE network | The Hubbub | hidden |
| 10.11.1.0/24 | Kynesim/SJ Internal STB networks | Richard Watts | rrw@kynesim.co.uk |
| 10.13.0.0/16 | Moss Bank | Steve McIntyre | stevem@chiark.greenend.org.uk |
| 10.16.0.0/16 | CMS private network | Jon Peatfield | J.S.Peatfield@damtp.cam.ac.uk |
| 10.17.0.0/16 | percysnoodle | Simon Booth | hidden |
| 10.19.3.0/24 | flarn.net private network | Rob Kendrick | rjek@rjek.com |
| 10.24.0.0/16 | DPMMS private network | Andrew C Aitchison | A.C.Aitchison@dpmms.cam.ac.uk |
| 10.28.0.0/16 | Kynesim | Richard Watts | rrw@kynesim.co.uk |
| 10.29.0.0/16 | Kynesim Cambridge per-workstation private routing | Richard Watts | rrw@kynesim.co.uk |
| 10.42.0.0/16 | 10-42.net (WSCICC - NoCat Northern California USA) | ron wickersham | rjw@alembic.com |
| 10.59.139.0/24 | bcxs.net Saltburn | Ben Smithurst | hidden |
| 10.64.160.0/20 | sheepynet | Nathan Howard | hidden |
| 10.80.211.0/24 | MalcWLAN | Malcolm Scott | camgrin@malc.org.uk |
| 10.100.0.0/18 | Moose / Retrosnub | Malcolm Scott | camgrin@malc.org.uk |
| 10.100.64.0/26 | CUSU internal | Malcolm Scott | hidden |
| 10.100.64.64/26 | SRCF internal | SRCF sysadmins | hidden |
| 10.100.100.0/24 | Oxford University Computer Society | David North | hidden |
| 10.112.168.0/23 | bcxs.net VPN | Ben Smithurst | hidden |
| 10.158.0.0/24 | bcxs.net Sheffield RO | Ben Smithurst | hidden |
| 10.174.236.0/24 | bcxs.net Stockton | Ben Smithurst | hidden |
| 10.197.113.0/24 | bcxs.net Sheffield BR | Ben Smithurst | hidden |
| 10.199.30.0/23 | bcxs.net Stockton | Ben Smithurst | hidden |
| 172.16.12.0/24 | rickp-home | Rick Payne | hidden |
| 172.16.22.0/24 | Empire House | Matthew Vernon | matthewv@chiark.greenend.org.uk |
| 172.16.32.0/24 | Bluelinux Private VLAN | Robert McQueen | hidden |
| 172.16.249.0/24 | Greysky [Sebastian's home network] | Sebastian Bleasdale | sbleas@chiark.greenend.org.uk |
| 172.17.78.160/28 | The Provincial Watsons | Kate Stitt | hidden |
| 172.17.207.0/24 | anjou.terraraq.org.uk | Richard Kettlewell | rjk@terraraq.org.uk |
| 172.17.217.0/24 | The Gallery | Gareth Taylor | hidden |
| 172.18.45.0/24 | Relativity | Ian Jackson | ian@davenant.greenend.org.uk |
| 172.18.87.0/24 | Vandercook College of Music | Stuart Brainerd | hidden |
| 172.18.174.0/24 | knight | knight | hidden |
| 172.18.218.0/24 | excommunication | Ian Jackson pp PTC | hidden |
| 172.19.71.0/24 | greenend-wlan-1 | Stephen Early | steve@greenend.org.uk |
| 172.19.243.0/24 | house.hemmel.com | Ian Jackson | hostmaster@hemmel.com |
| 172.19.244.0/24 | Paintbox | S. Arrowmith | hidden |
| 172.19.252.0/24 | wonky.org.uk VPN | James Green | hidden |
| 172.20.0.0/24 | cam.dziewulski.com | Jan M. Dziewulski | hidden |
| 172.20.44.0/24 | ethereal.impropriety.org.uk | Ross Younger | 0ryoungerk.camgrin@chiark.greenend.org.uk |
| 172.20.45.0/24 | virtual.impropriety.org.uk | Ross Younger | 0ryoungerk.camgrin@chiark.greenend.org.uk |
| 172.20.153.0/24 | Aragon Close | Colin Watson | cjwatson@chiark.greenend.org.uk |
| 172.21.21.0/24 | local.liyang.hu | Liyang HU | hidden |
| 172.21.28.0/22 | The Tropic Organisation | Mike Pinna | hidden |
| 172.21.52.80/28 | Splicky VPN | Elliot Fairweather | hidden |
| 172.21.115.0/24 | Camberwick Green | Theo Markettos | hidden |
| 172.21.116.0/24 | Camberwick Green | Theo Markettos | hidden |
| 172.22.0.0/24 | OUCS internal | Robin Stevens | hidden |
| 172.22.64.0/24 | Collabora HQ | Simon McVittie | hidden |
| 172.22.65.0/24 | Collabora HQ -- guest network | Simon McVittie | hidden |
| 172.22.73.0/24 | Synapse Networks, Inc. | Stuart Brainerd | hidden |
| 172.22.128.0/20 | ankh.org | James Hawtin | hidden |
| 172.22.178.0/24 | grmbl.intern | Bram Dumolin | hidden |
| 172.22.195.64/28 | Panacea WLAN | Owen Dunn | owend@chiark.greenend.org.uk |
| 172.22.198.0/24 | vpn.pseudorandom.co.uk | Simon McVittie | hidden |
| 172.22.238.0/24 | 1023 W Oakdale | Stuart Brainerd | hidden |
| 172.23.32.0/24 | Silverwood Close | Robert McQueen | robot101@hadesian.co.uk |
| 172.24.44.0/24 | McCracken Frank | stuart brainerd | hidden |
| 172.24.172.0/24 | CUR1350 Internal Network | CUR1350 Chief Engineer | hidden |
| 172.24.200.0/24 | PILM | Stuart Brainerd | hidden |
| 172.24.224.0/24 | Chris Emerson's house. | Chris Emerson | hidden |
| 172.25.0.0/16 | banana.intern | Bram Dumolin | hidden |
| 172.25.0.0/24 | dwanet | al | hidden |
| 172.25.100.0/24 | forthview | Fearghas McKay | hidden |
| 172.25.125.0/24 | abbey-10 | Andrew Bower | hidden |
| 172.25.187.48/28 | abbey-20 | Andrew Bower | hidden |
| 172.25.229.0/24 | Translexis Ltd internal IP addresses | Richard Watts | rrw@semiramis.org.uk |
| 172.26.0.0/20 | Home network | Paul Wood | hidden |
| 172.26.64.0/24 | Individual Pubs Limited public access wireless | Stephen Early | sde@individualpubs.co.uk |
| 172.26.200.0/24 | bindweed | Tom Womack | tom@womack.net |
| 172.27.21.0/24 | Thyme Private Network | Jonathan Amery | jdamery@chiark.greenend.org.uk |
| 172.27.134.0/24 | Gallery wireless subnet | Ben Harris | bjh21@bjh21.me.uk |
| 172.28.3.0/24 | castellan.local | Jacob Nevins | hidden |
| 172.28.144.0/24 | MJW house network | Matthew Woodcraft | matthew@woodcraft.me.uk |
| 172.28.227.0/24 | Elm network | Jon Peatfield | J.S.Peatfield@damtp.cam.ac.uk |
| 172.29.85.0/24 | Mariners Way | Andrew Kanaber | hidden |
| 172.29.176.192/28 | Virtue (Daniel Vernon) | Matthew Vernon | matthewv@chiark.greenend.org.uk |
| 172.29.198.0/23 | distorted.org.uk | Mark Wooding | mdw@distorted.org.uk |
| 172.30.52.0/22 | Individual Pubs Limited | Stephen Early | sde@individualpubs.co.uk |
| 172.30.80.0/20 | s-mart.net | David Coles | david@disintegration.org |
| 172.30.150.80/28 | Bluelinux SOV<->CAM | Robert McQueen | hidden |
| 172.30.176.0/20 | TPICL | David Coles | david@disintegration.org |
| 172.30.206.0/24 | Xen xm-test testing networks | Ian Jackson | hidden |
| 172.30.206.0/24 | quick tests and experiments - feel free to use | Ian Jackson | ian@davenant.greenend.org.uk |
| 172.30.224.0/24 | aglet internal | Robin Stephenson | hidden |
| 172.31.38.64/27 | Splicky | Elliot Fairweather | hidden |
| 172.31.59.0/24 | wlan.anjou.terraraq.org.uk | Richard Kettlewell | rjk@terraraq.org.uk |
| 172.31.66.0/24 | Stardust [Simon Tatham's house] | Simon Tatham | anakin@pobox.com |
| 172.31.79.0/24 | chiark ip-over-http | Ian Jackson | sysadmin@chiark.greenend.org.uk |
| 172.31.80.0/24 | chiark users' small vpn subnets | Ian Jackson | sysadmin@chiark.greenend.org.uk |
| 172.31.85.0/24 | intra.ab8.net | Andrew Bower | hidden |
| 192.168.0.0/24 | Cametrics | Philip Kendall | hidden |
| 192.168.1.0/24 | Panacea | Owen Dunn | owend@chiark.greenend.org.uk |
| 192.168.2.0/24 | aibs.org.uk | David Henderson | hidden |
| 192.168.3.0/24 | The Tea Party | Tom Yates | hidden |
| 192.168.5.0/24 | 5 Thomas Way | John Matthews | john@matthews-net.org.uk |
| 192.168.5.0/24 | Cametrics | Philip Kendall | hidden |
| 192.168.7.0/24 | siamese-net | Junio Hamano | hidden |
| 192.168.10.0/24 | .fudge, Durham | Tim Packer | fudge@durge.org |
| 192.168.11.0/24 | JCN private network | JCN Sysadmins | jcn-grin-registration@jesus.cam.ac.uk |
| 192.168.15.0/24 | Starwort | Ian Collier | imc@livejournal.com |
| 192.168.29.0/24 | CB23 7** | Paul Mansfield | hidden |
| 192.168.37.0/24 | cattery.greenend.org.uk | Christi Alice Scarborough | christi@chiark.greenend.org.uk |
| 192.168.38.0/24 | wireless.cattery.greenend.org.uk | Christi Alice Scarborough | christi@chiark.greenend.org.uk |
| 192.168.42.0/24 | GJC Tech | Geoff Lane | hidden |
| 192.168.44.0/24 | 44 Darwin Drive | Oli Wade | hidden |
| 192.168.68.0/25 | Phil's Crossbar | Phil Cross | hidden |
| 192.168.73.0/24 | greenend-main-100 | Stephen Early | steve@greenend.org.uk |
| 192.168.76.0/24 | Anthill | Duncan MacGregor | duncanm@chiark.greenend.org.uk |
| 192.168.93.0/24 | Lilac Court | David Damerell | damerell@chiark.greenend.org.uk |
| 192.168.100.0/24 | Virgin Media cable modem diagnostics | Ben Harris | bjh21@bjh21.me.uk |
| 192.168.101.0/28 | GJC Tech Remote | Geoff Lane | hidden |
| 192.168.121.0/24 | Enigma | Dave Manning | hidden |
| 192.168.126.0/24 | Exning Road | Chris Reed | cr212@iname.com |
| 192.168.127.0/24 | www.rzr.online.fr | rzr | hidden |
| 192.168.131.0/24 | John Matthews USA | John Matthews | john@matthews-net.org.uk |
| 192.168.140.0/24 | MGM | Phil Kard | hidden |
| 192.168.144.0/24 | mainspring.lan | James Scott | hidden |
| 192.168.171.64/26 | iron.denterprises.org | Colin Wetherbee | cww@denterprises.org |
| 192.168.190.0/24 | Babraham Road Supernet | Jon Warbrick | hidden |
| 192.168.200.0/24 | Mandrake | Mike Wilmot-Dear | hidden |
| 192.168.224.0/24 | Curlew Street | Moray Allan | moray@sermisy.org |
| 192.168.225.0/24 | MOOSE test network | Malcolm Scott | camgrin@malc.org.uk |
| 192.168.226.0/24 | MalcNet | Malcolm Scott | camgrin@malc.org.uk |
| 192.168.228.0/24 | Jowett | Malcolm Scott | camgrin@malc.org.uk |
| 192.168.229.0/24 | Jowett 2 | Malcolm Scott | camgrin@malc.org.uk |
| 192.168.243.0/24 | ren | ren | hidden |