NumberResearch Membership · Data 09/20/2026

Thousands-blocks in 251-380

This prefix’s ten 1,000-number blocks and who holds each — 10 on record · from the daily NANPA thousands-block report, 09/20/2026

Full prefixes (NXX) Thousands-blocks (1,000-number pools)

The ten 1,000-number thousand-blocks inside prefix 251-380 and who was initially assigned each. Under pooling these blocks often belong to different carriers — the single prefix-level “assignee” is usually just the pool / code holder, not who holds the numbers. ← all 251 blocks

Most active assignees, all time — NPA 251
BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 7
TELEPAK NETWORKS, INC. - AL 2
COMCAST IP PHONE, LLC 1
New assignments by month Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025 Oct 2025
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Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
— 251-380-0XXX 0000–0999Reserved BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-380-1XXX 1000–1999Reserved BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-380-2XXX 2000–2999Reserved BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-380-3XXX 3000–3999Reserved BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-380-4XXX 4000–4999Reserved BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
— 251-380-5XXX 5000–5999Reserved BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL
2012-11-26 251-380-6XXX 6000–6999Assigned COMCAST IP PHONE, LLC 318J MOBILE AL
2011-04-05 251-380-7XXX 7000–7999Assigned TELEPAK NETWORKS, INC. - AL 947G MOBILE AL
2011-04-05 251-380-8XXX 8000–8999Assigned TELEPAK NETWORKS, INC. - AL 947G MOBILE AL
— 251-380-9XXX 9000–9999Reserved BELLSOUTH TELECOMM INC DBA SOUTH CENTRAL BELL TEL 9419 MOBILE AL

Source: NANPA Thousands Block Assignment Report (All Regions, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.