NumberResearch Membership · Data 09/20/2026

Recent thousands-block assignments

6 blocks assigned in the last 30 days · from the daily NANPA thousands-block report, 09/20/2026

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

Most carrier growth happens here, not at the prefix level: under number pooling, carriers receive individual 1,000-number blocks (e.g. 626-470-0XXX) within already-assigned prefixes. Assignments are initial assignments — the current serving carrier of individual numbers may differ due to portability.

Most active assignees, last 30 days — NPA 313
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MI 4
OPENTACT INC. 1
INTRADO COMMUNICATIONS, 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
Clear Download CSV ↓
Recent thousands-block assignments
AssignedThousands-blockLast 4 digitsStatusAssigneeOCNRate centerState
2006-04-25 313-543-5XXX 5000–5999Assigned PAETEC ITEL, LLC 829J DETROITZN5 MI
2006-04-04 313-270-0XXX 0000–0999Assigned PAETEC ITEL, LLC 829J DETROITZN4 MI
2006-03-22 313-221-1XXX 1000–1999Assigned PAETEC ITEL, LLC 829J DETROITZN1 MI
2006-03-22 313-299-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J DETROITZN6 MI
2006-03-22 313-731-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J DETROITZN3 MI
2006-03-10 313-821-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J DETROITZN2 MI
2006-02-09 313-203-8XXX 8000–8999Assigned BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN6 MI
2006-02-02 313-731-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C DETROITZN3 MI
2006-01-31 313-416-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J DETROITZN4 MI
2006-01-30 313-642-6XXX 6000–6999Assigned PAETEC ITEL, LLC 829J DETROITZN2 MI
2006-01-19 313-740-7XXX 7000–7999Assigned AT&T ENTERPRISES, LLC 516C DETROITZN5 MI
2006-01-17 313-412-2XXX 2000–2999Assigned COMCAST IP PHONE, LLC 318J DETROITZN5 MI
2006-01-13 313-354-8XXX 8000–8999Assigned PAETEC ITEL, LLC 829J DETROITZN5 MI
2006-01-10 313-216-9XXX 9000–9999Assigned PAETEC ITEL, LLC 829J DETROITZN6 MI
2006-01-04 313-334-0XXX 0000–0999Assigned METROPCS, INC. 5562 DETROITZN3 MI
2006-01-04 313-334-2XXX 2000–2999Assigned METROPCS, INC. 5562 DETROITZN3 MI
2006-01-04 313-334-8XXX 8000–8999Assigned METROPCS, INC. 5562 DETROITZN3 MI
2006-01-04 313-334-9XXX 9000–9999Assigned METROPCS, INC. 5562 DETROITZN3 MI
2006-01-04 313-346-2XXX 2000–2999Assigned METROPCS, INC. 5562 DETROITZN3 MI
2006-01-04 313-346-3XXX 3000–3999Assigned METROPCS, INC. 5562 DETROITZN3 MI
2006-01-04 313-346-7XXX 7000–7999Assigned METROPCS, INC. 5562 DETROITZN3 MI
2006-01-04 313-422-3XXX 3000–3999Assigned METROPCS, INC. 5562 DETROITZN3 MI
2006-01-04 313-422-5XXX 5000–5999Assigned METROPCS, INC. 5562 DETROITZN3 MI
2006-01-04 313-425-1XXX 1000–1999Assigned METROPCS, INC. 5562 DETROITZN6 MI
2006-01-04 313-434-9XXX 9000–9999Assigned METROPCS, INC. 5562 DETROITZN5 MI
2006-01-04 313-452-2XXX 2000–2999Assigned METROPCS, INC. 5562 DETROITZN5 MI
2006-01-04 313-457-3XXX 3000–3999Assigned METROPCS, INC. 5562 DETROITZN6 MI
2006-01-04 313-457-5XXX 5000–5999Assigned METROPCS, INC. 5562 DETROITZN6 MI
2006-01-04 313-544-0XXX 0000–0999Assigned METROPCS, INC. 5562 DETROITZN4 MI
2006-01-04 313-544-3XXX 3000–3999Assigned METROPCS, INC. 5562 DETROITZN4 MI
2006-01-04 313-544-6XXX 6000–6999Assigned METROPCS, INC. 5562 DETROITZN4 MI
2006-01-04 313-544-8XXX 8000–8999Assigned METROPCS, INC. 5562 DETROITZN4 MI
2006-01-04 313-586-2XXX 2000–2999Assigned METROPCS, INC. 5562 DETROITZN6 MI
2006-01-04 313-624-6XXX 6000–6999Assigned METROPCS, INC. 5562 DETROITZN6 MI
2006-01-04 313-629-2XXX 2000–2999Assigned METROPCS, INC. 5562 DETROITZN5 MI
2006-01-04 313-629-3XXX 3000–3999Assigned METROPCS, INC. 5562 DETROITZN5 MI
2006-01-04 313-629-4XXX 4000–4999Assigned METROPCS, INC. 5562 DETROITZN5 MI
2006-01-04 313-629-5XXX 5000–5999Assigned METROPCS, INC. 5562 DETROITZN5 MI
2006-01-04 313-629-7XXX 7000–7999Assigned METROPCS, INC. 5562 DETROITZN5 MI
2006-01-04 313-629-8XXX 8000–8999Assigned METROPCS, INC. 5562 DETROITZN5 MI
2006-01-04 313-633-5XXX 5000–5999Assigned METROPCS, INC. 5562 DETROITZN6 MI
2006-01-04 313-646-0XXX 0000–0999Assigned METROPCS, INC. 5562 DETROITZN4 MI
2006-01-04 313-646-3XXX 3000–3999Assigned METROPCS, INC. 5562 DETROITZN4 MI
2006-01-04 313-646-5XXX 5000–5999Assigned METROPCS, INC. 5562 DETROITZN4 MI
2006-01-04 313-743-1XXX 1000–1999Assigned METROPCS, INC. 5562 DETROITZN2 MI
2006-01-04 313-743-2XXX 2000–2999Assigned METROPCS, INC. 5562 DETROITZN2 MI
2006-01-04 313-768-7XXX 7000–7999Assigned METROPCS, INC. 5562 DETROITZN6 MI
2006-01-04 313-926-0XXX 0000–0999Assigned METROPCS, INC. 5562 DETROITZN2 MI
2006-01-04 313-926-1XXX 1000–1999Assigned METROPCS, INC. 5562 DETROITZN2 MI
2006-01-04 313-926-2XXX 2000–2999Assigned METROPCS, INC. 5562 DETROITZN2 MI

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.