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Range holder

Windsor Telecom Limited

Windsor Telecom Limited is listed by Ofcom as the originally-allocated provider for 671 UK number ranges, mostly landline (01/02). Numbers within these blocks may have since been ported to a different carrier.

Windsor Telecom Limited at a glance

Number ranges
671
Number types
  • Landline (01/02) 599
  • UK-wide (03) 29
  • Service (084/087) 19
  • Freephone (080) 13
  • Premium rate (09) 9
  • Personal (070) 2
First allocation
24 January 2002
Latest allocation
14 October 2019
Most blocks in
01366 Downham Market, 020 London, 023 Southampton & Portsmouth

Source: Ofcom numbering data, re-imported weekly. Each range is counted once.

Allocated ranges by year

The year Ofcom allocated each range Windsor Telecom Limited still holds; the busiest year was 2010 (595).

200217
20041
20063
200715
20082
20092
2010595
201130
20124
20191

If a number from Windsor Telecom Limited's ranges called you

No clear pattern in reports for these numbers yet. If a call worried you:

  1. 1

    Call back on a number you trust

    If a caller says they're your bank, HMRC, a courier or a council, hang up and ring the organisation on the number from its website or your statement, never the number that called you. Caller ID can be faked.

  2. 2

    Forward it to 7726

    On a mobile, copy the caller's number from your recent calls and text it to 7726 (it spells SPAM). Scam texts can be forwarded to 7726 as they are. It's free, and your network uses the reports to investigate and block numbers.

    Ofcom: what to do about a scam call ↗

  3. 3

    Stop sales calls

    Register your landline and mobile free with the Telephone Preference Service (0345 070 0707). Legitimate UK marketers must check it; calls should drop within 28 days. It won't stop scammers.

    Telephone Preference Service ↗

  4. 4

    If you lost money or shared details

    Call your bank on the number on your card (or 159 to reach most UK banks safely), then report it to Report Fraud online or on 0300 123 2040. Report Fraud replaced Action Fraud on 4 December 2025 for England, Wales and Northern Ireland; in Scotland call Police Scotland on 101.

    159 (Stop Scams UK) ↗Report Fraud ↗

All Windsor Telecom Limited ranges671, by prefix
PrefixStatus
+44 113400Allocated
+44 114408Allocated
+44 115740Allocated
+44 116416Allocated
+44 117259Allocated
+44 118418Allocated
+44 1200858Allocated
+44 1202946Allocated
+44 1204274Allocated
+44 1205340Allocated
+44 1206654Allocated
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+44 1208609Allocated
+44 1209585Allocated
+44 121401Allocated
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+44 1224909Allocated
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+44 1226890Allocated
+44 1227686Allocated
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+44 1229220Allocated
+44 1233273Allocated
+44 1234949Allocated
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+44 1236321Allocated
+44 1237706Allocated
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+44 1241657Allocated
+44 1242329Allocated
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+44 1244554Allocated
+44 1245925Allocated
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+44 909072Allocated
+44 909644Allocated

Related lookups

Frequently asked questions

What does it mean that Windsor Telecom Limited is the range holder?

Ofcom allocated the blocks listed on this page to Windsor Telecom Limited. A number keeps its digits when its user switches provider, so a number in these blocks may now be on another network; Ofcom doesn't publish who a number is on today.

What kinds of numbers does Windsor Telecom Limited hold?

Of its 671 allocated ranges: 599 landline (01/02), 29 uk-wide (03), 19 service (084/087), 13 freephone (080), 9 premium rate (09), 2 personal (070). The oldest dates from 24 January 2002 and the newest from 14 October 2019.

Which area codes does Windsor Telecom Limited have most numbers in?

By allocated blocks: 01366 Downham Market (2), 020 London (2), 023 Southampton & Portsmouth (2), 0113 Leeds (1), 0114 Sheffield (1).

How often is the Windsor Telecom Limited list updated?

Ofcom publishes its numbering data every Wednesday and this page is rebuilt from it weekly, so new Windsor Telecom Limited blocks appear within about a week.