0231 area code: Southampton numbers starting 023 1
0231 is not a separate area code. It is Southampton (023) followed by local numbers starting 1.
10,000 numbers are allocated in 1 block to 1 listed holders (Ofcom, 14 Oct 2026).
Check a 0231 number privately
Number ranges registered under 023 1
| Number range | Listed holder | Status | Allocation date |
|---|---|---|---|
| 023 11050000 – 023 11059999 | Vodafone Ltd (C&W) | Allocated | 2021-11-15 |
| 023 10000000 – 023 10009999 | Not listed | Protected | Not recorded |
| 023 10010000 – 023 10019999 | Not listed | Protected | Not recorded |
| 023 10020000 – 023 10029999 | Not listed | Protected | Not recorded |
| 023 10030000 – 023 10039999 | Not listed | Protected | Not recorded |
| 023 10040000 – 023 10049999 | Not listed | Protected | Not recorded |
| 023 10050000 – 023 10059999 | Not listed | Protected | Not recorded |
| 023 10060000 – 023 10069999 | Not listed | Protected | Not recorded |
| 023 10070000 – 023 10079999 | Not listed | Protected | Not recorded |
| 023 10080000 – 023 10089999 | Not listed | Protected | Not recorded |
| 023 10090000 – 023 10099999 | Not listed | Protected | Not recorded |
| 023 10100000 – 023 10109999 | Not listed | Protected | Not recorded |
| 023 10110000 – 023 10119999 | Not listed | Protected | Not recorded |
| 023 10120000 – 023 10129999 | Not listed | Protected | Not recorded |
| 023 10130000 – 023 10139999 | Not listed | Protected | Not recorded |
| 023 10140000 – 023 10149999 | Not listed | Protected | Not recorded |
| 023 10150000 – 023 10159999 | Not listed | Protected | Not recorded |
| 023 10160000 – 023 10169999 | Not listed | Protected | Not recorded |
| 023 10170000 – 023 10179999 | Not listed | Protected | Not recorded |
| 023 10180000 – 023 10189999 | Not listed | Protected | Not recorded |
| 023 10190000 – 023 10199999 | Not listed | Protected | Not recorded |
| 023 10200000 – 023 10209999 | Not listed | Protected | Not recorded |
| 023 10210000 – 023 10219999 | Not listed | Protected | Not recorded |
| 023 10220000 – 023 10229999 | Not listed | Protected | Not recorded |
| 023 10230000 – 023 10239999 | Not listed | Protected | Not recorded |
| 023 10240000 – 023 10249999 | Not listed | Protected | Not recorded |
| 023 10250000 – 023 10259999 | Not listed | Protected | Not recorded |
| 023 10260000 – 023 10269999 | Not listed | Protected | Not recorded |
| 023 10270000 – 023 10279999 | Not listed | Protected | Not recorded |
| 023 10280000 – 023 10289999 | Not listed | Protected | Not recorded |
| 023 10290000 – 023 10299999 | Not listed | Protected | Not recorded |
| 023 10300000 – 023 10309999 | Not listed | Protected | Not recorded |
| 023 10310000 – 023 10319999 | Not listed | Protected | Not recorded |
| 023 10320000 – 023 10329999 | Not listed | Protected | Not recorded |
| 023 10330000 – 023 10339999 | Not listed | Protected | Not recorded |
| 023 10340000 – 023 10349999 | Not listed | Protected | Not recorded |
| 023 10350000 – 023 10359999 | Not listed | Protected | Not recorded |
| 023 10360000 – 023 10369999 | Not listed | Protected | Not recorded |
| 023 10370000 – 023 10379999 | Not listed | Protected | Not recorded |
| 023 10380000 – 023 10389999 | Not listed | Protected | Not recorded |
| 023 10390000 – 023 10399999 | Not listed | Protected | Not recorded |
| 023 10400000 – 023 10409999 | Not listed | Protected | Not recorded |
| 023 10410000 – 023 10419999 | Not listed | Protected | Not recorded |
| 023 10420000 – 023 10429999 | Not listed | Protected | Not recorded |
| 023 10430000 – 023 10439999 | Not listed | Protected | Not recorded |
| 023 10440000 – 023 10449999 | Not listed | Protected | Not recorded |
| 023 10450000 – 023 10459999 | Not listed | Protected | Not recorded |
| 023 10460000 – 023 10469999 | Not listed | Protected | Not recorded |
| 023 10470000 – 023 10479999 | Not listed | Protected | Not recorded |
| 023 10480000 – 023 10489999 | Not listed | Protected | Not recorded |
| 023 10490000 – 023 10499999 | Not listed | Protected | Not recorded |
| 023 10500000 – 023 10509999 | Not listed | Protected | Not recorded |
| 023 10510000 – 023 10519999 | Not listed | Protected | Not recorded |
| 023 10520000 – 023 10529999 | Not listed | Protected | Not recorded |
| 023 10530000 – 023 10539999 | Not listed | Protected | Not recorded |
| 023 10540000 – 023 10549999 | Not listed | Protected | Not recorded |
| 023 10550000 – 023 10559999 | Not listed | Protected | Not recorded |
| 023 10560000 – 023 10569999 | Not listed | Protected | Not recorded |
| 023 10570000 – 023 10579999 | Not listed | Protected | Not recorded |
| 023 10580000 – 023 10589999 | Not listed | Protected | Not recorded |
| 023 10590000 – 023 10599999 | Not listed | Protected | Not recorded |
| 023 10600000 – 023 10609999 | Not listed | Protected | Not recorded |
| 023 10610000 – 023 10619999 | Not listed | Protected | Not recorded |
| 023 10620000 – 023 10629999 | Not listed | Protected | Not recorded |
| 023 10630000 – 023 10639999 | Not listed | Protected | Not recorded |
| 023 10640000 – 023 10649999 | Not listed | Protected | Not recorded |
| 023 10650000 – 023 10659999 | Not listed | Protected | Not recorded |
| 023 10660000 – 023 10669999 | Not listed | Protected | Not recorded |
| 023 10670000 – 023 10679999 | Not listed | Protected | Not recorded |
| 023 10680000 – 023 10689999 | Not listed | Protected | Not recorded |
| 023 10690000 – 023 10699999 | Not listed | Protected | Not recorded |
| 023 10700000 – 023 10709999 | Not listed | Protected | Not recorded |
| 023 10710000 – 023 10719999 | Not listed | Protected | Not recorded |
| 023 10720000 – 023 10729999 | Not listed | Protected | Not recorded |
| 023 10730000 – 023 10739999 | Not listed | Protected | Not recorded |
| 023 10740000 – 023 10749999 | Not listed | Protected | Not recorded |
| 023 10750000 – 023 10759999 | Not listed | Protected | Not recorded |
| 023 10760000 – 023 10769999 | Not listed | Protected | Not recorded |
| 023 10770000 – 023 10779999 | Not listed | Protected | Not recorded |
| 023 10780000 – 023 10789999 | Not listed | Protected | Not recorded |
| 023 10790000 – 023 10799999 | Not listed | Protected | Not recorded |
| 023 10800000 – 023 10809999 | Not listed | Protected | Not recorded |
| 023 10810000 – 023 10819999 | Not listed | Protected | Not recorded |
| 023 10820000 – 023 10829999 | Not listed | Protected | Not recorded |
| 023 10830000 – 023 10839999 | Not listed | Protected | Not recorded |
| 023 10840000 – 023 10849999 | Not listed | Protected | Not recorded |
| 023 10850000 – 023 10859999 | Not listed | Protected | Not recorded |
| 023 10860000 – 023 10869999 | Not listed | Protected | Not recorded |
| 023 10870000 – 023 10879999 | Not listed | Protected | Not recorded |
| 023 10880000 – 023 10889999 | Not listed | Protected | Not recorded |
| 023 10890000 – 023 10899999 | Not listed | Protected | Not recorded |
| 023 10900000 – 023 10909999 | Not listed | Protected | Not recorded |
| 023 10910000 – 023 10919999 | Not listed | Protected | Not recorded |
| 023 10920000 – 023 10929999 | Not listed | Protected | Not recorded |
| 023 10930000 – 023 10939999 | Not listed | Protected | Not recorded |
| 023 10940000 – 023 10949999 | Not listed | Protected | Not recorded |
| 023 10950000 – 023 10959999 | Not listed | Protected | Not recorded |
| 023 10960000 – 023 10969999 | Not listed | Protected | Not recorded |
| 023 10970000 – 023 10979999 | Not listed | Protected | Not recorded |
| 023 10980000 – 023 10989999 | Not listed | Protected | Not recorded |
900 more ranges — full list in CSV.
0231 allocation
Blocks whose local number starts with 1 under Southampton (023): 10,000 allocated numbers in 1 block.
- Protected
- 9,990,000 numbers · 999 blocks
- Allocated
- 10,000 numbers · 1 block
Holders of 023 1 numbers
Vodafone Ltd (C&W) holds 100.0% of the allocated numbers (10,000 numbers, 1 block).
| Holder | Share | Numbers | Blocks | Earliest allocation |
|---|---|---|---|---|
| Vodafone Ltd (C&W) | 100.0% | 10,000 | 1 | 2021-11-15 |
Weekly changes for 0231
0 block changes from 19 Aug 2026 to 17 Oct 2026. Each week counts a block once.
| From | To | Changed blocks |
|---|---|---|
| 2026-08-19 | 2026-08-26 | 0 |
| 2026-08-26 | 2026-09-02 | 0 |
| 2026-09-02 | 2026-09-09 | 0 |
| 2026-09-09 | 2026-09-16 | 0 |
| 2026-09-16 | 2026-09-24 | 0 |
| 2026-09-24 | 2026-09-30 | 0 |
| 2026-09-30 | 2026-10-07 | 0 |
| 2026-10-07 | 2026-10-17 | 0 |
These numbers belong to 023 Southampton. Methodology.
0231 source: Ofcom s1.csv, published 14 Oct 2026. Download 023 1 blocks (CSV). Contains Ofcom copyright material.
Source detail · 0231
| Claim | Value | Identifier |
|---|---|---|
| allocated_numbers | 10000 | subcode:023-1:allocated_numbers:fc227d9e:v1 |
| allocated_records | 1 | subcode:023-1:allocated_records:fc227d9e:v1 |
| listed_holders | 1 | subcode:023-1:listed_holders:fc227d9e:v1 |
| area_code | 023 | subcode:023-1:area_code:fc227d9e:v1 |
| first_digit | 1 | subcode:023-1:first_digit:fc227d9e:v1 |
| snapshot_date | 14 Oct 2026 | subcode:023-1:snapshot_date:fc227d9e:v1 |