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Range holder

Network Rail Infrastructure Limited

Network Rail Infrastructure Limited is listed by Ofcom as the originally-allocated provider for 37 UK number ranges, mostly uk-wide (03). Numbers within these blocks may have since been ported to a different carrier.

Network Rail Infrastructure Limited at a glance

Number ranges
37 (12 allocated)
Number types
  • UK-wide (03) 7
  • Corporate / VoIP (05) 5
First allocation
13 January 2005
Latest allocation
4 September 2014

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

Allocated ranges by year

The year Ofcom allocated each range Network Rail Infrastructure Limited still holds; the busiest year was 2014 (7).

20055
20147

If a number from Network Rail Infrastructure 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 ↗

Network Rail Infrastructure Limited ranges by Ofcom status
StatusRangesWhat it means
Reserved25the block is being held back from the general assignment pool
Allocated12the block is currently in active service with a communications provider
All Network Rail Infrastructure Limited ranges37, by prefix
PrefixStatus
+44 330852Allocated
+44 330853Allocated
+44 330855Allocated
+44 330856Allocated
+44 330857Allocated
+44 330858Allocated
+44 330859Allocated
+44 555570Reserved
+44 555571Reserved
+44 555572Reserved
+44 555573Reserved
+44 555574Reserved
+44 555575Reserved
+44 555576Reserved
+44 555577Reserved
+44 555578Reserved
+44 555579Reserved
+44 555580Reserved
+44 555581Reserved
+44 555582Reserved
+44 555583Reserved
+44 555584Allocated
+44 555585Reserved
+44 555586Allocated
+44 555587Reserved
+44 555588Allocated
+44 555589Allocated
+44 555590Reserved
+44 555591Reserved
+44 555592Reserved
+44 555593Allocated
+44 555594Reserved
+44 555595Reserved
+44 555596Reserved
+44 555597Reserved
+44 555598Reserved
+44 555599Reserved

Frequently asked questions

What does it mean that Network Rail Infrastructure Limited is the range holder?

Ofcom allocated the blocks listed on this page to Network Rail Infrastructure 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 Network Rail Infrastructure Limited hold?

Of its 12 allocated ranges: 7 uk-wide (03), 5 corporate / voip (05). The oldest dates from 13 January 2005 and the newest from 4 September 2014.

How often is the Network Rail Infrastructure Limited list updated?

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