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| 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 |