Colt Technology Services in Oxford

About Colt Technology Services’s Oxford allocation

When Colt Technology Services is the range holder for +44 1865 it means Ofcom recorded Colt Technology Services as the provider entitled to issue numbers from these blocks when they were first allocated under the UK National Telephone Numbering Plan. 32 Oxford-facing blocks sit against Colt Technology Services in the current Ofcom snapshot, each of which can carry up to ten thousand individual digits available for assignment to end customers.

Oxford’s Oxfordshire telecoms estate is shaped by Oxford's catchment of roughly 162,000 residents: a dense urban exchange typically hosts allocations from several national operators in parallel, which is why you see Colt Technology Services’s blocks alongside other range holders on the same 01865 code. Local switching capacity, historic Openreach exchange footprints, and Colt Technology Services’s wholesale routing arrangements all influence which blocks land in Oxford rather than elsewhere on the national plan.

Treat this allocation as a starting point, not a verdict on any specific caller. UK numbers are portable, so the current carrier on a given 01865 digit string may differ from the range holder shown — read Range Holder vs current provider for the distinction, and How Ofcom allocates UK phone numbers for the wider context behind the table below.