Recent prefix assignments

374 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 10/01/2026

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

The Code holder is who opened each NPA-NXX prefix — not necessarily who holds the numbers. A prefix is 10,000 numbers, but under pooling its ten 1,000-number blocks are handed out individually, often to different carriers; the code holder may hold only one block, or none. The Thousands-blocks column shows how the ten blocks are really split — click which blocks → to see who holds each 1,000-number block and its last-4-digit range. Assignments are initial assignments; the current serving carrier may differ due to portability.

Most active assignees, last 30 days

Rogers Communications Canada Inc. (Wireless) 46

8X8, INC. 43

NEW CINGULAR WIRELESS PCS, LLC - DC 28

NEW CINGULAR WIRELESS PCS, LLC - IL 23

ONVOY, LLC - CA 19

New assignments by month Oct 2026 Sep 2026 Aug 2026 Jul 2026 Jun 2026 May 2026 Apr 2026 Mar 2026 Feb 2026 Jan 2026 Dec 2025 Nov 2025

Quick find in this area code:

Recent NPA-NXX prefix assignments
Assigned	NPA-NXX	Thousands-blocks taken (last-4 opening)	Code holder	OCN	Rate center	State
—	503-312	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR	5820	PORTLAND	OR
—	503-313	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR	5820	PORTLAND	OR
—	503-314	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR	5820	PORTLAND	OR
—	503-315	not yet reported which blocks →	QWEST CORPORATION	9638	SALEM	OR
—	503-316	not yet reported which blocks →	QWEST CORPORATION	9638	SALEM	OR
—	503-317	not yet reported which blocks →	T-MOBILE USA, INC.	6529	PORTLAND	OR
—	503-318	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR	5820	PORTLAND	OR
—	503-319	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR	5820	PORTLAND	OR
—	503-320	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR	5820	PORTLAND	OR
—	503-321	not yet reported which blocks →	QWEST CORPORATION	9638	PORTLAND	OR
—	503-322	not yet reported which blocks →	UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR	4520	GARIBALDI	OR
—	503-323	not yet reported which blocks →	QWEST CORPORATION	9638	PORTLAND	OR
—	503-324	not yet reported which blocks →	ZIPLY FIBER PACIFIC, LLC DBA ZIPLY FIBER	517K	BEAVERTON	OR
—	503-325	not yet reported which blocks →	QWEST CORPORATION	9638	ASTORIA	OR
—	503-326	not yet reported which blocks →	QWEST CORPORATION	9638	PORTLAND	OR
—	503-327	1XXX3XXX4XXX5XXX6XXX9XXX · 2 holders which blocks →	TELEPORT COMMUNICATIONS AMERICA, LLC - OR	7531	PORTLAND	OR
—	503-328	3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks →	ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM	7172	GRESHAM	OR
—	503-329	not yet reported which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	PORTLAND	OR
—	503-330	none assigned yet which blocks →	METROPCS, INC.	5562	BEAVERTON	OR
—	503-331	not yet reported which blocks →	QWEST CORPORATION	9638	PORTLAND	OR
—	503-332	none assigned yet which blocks →	METROPCS, INC.	5562	BEAVERTON	OR
—	503-334	0–9 XXXall 10 · 3 holders which blocks →	T-MOBILE USA, INC.	6529	PORTLAND	OR
—	503-335	not yet reported which blocks →	QWEST CORPORATION	9638	PORTLAND	OR
—	503-337	not yet reported which blocks →	CASCADE UTILITIES, INC.	2371	ESTACADA	OR
—	503-338	none assigned yet which blocks →	QWEST CORPORATION	9638	ASTORIA	OR
—	503-339	4XXX5XXX6XXX7XXX · 3 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - OR	3234	SALEM	OR
—	503-340	not yet reported which blocks →	QWEST CORPORATION	9638	PORTLAND	OR
—	503-341	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR	5820	PORTLAND	OR
—	503-342	2XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - OR	3234	CLACKAMAS	OR
—	503-343	0XXX1XXX2XXX4XXX8XXX9XXX · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - OR	3234	CLACKAMAS	OR
—	503-344	0XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - OR	3234	CLACKAMAS	OR
—	503-345	none assigned yet which blocks →	LEVEL 3 COMMUNICATIONS, LLC - OR	3234	PORTLAND	OR
—	503-346	not yet reported which blocks →	QWEST CORPORATION	9638	PORTLAND	OR
—	503-347	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR	5820	PORTLAND	OR
—	503-348	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR	5820	PORTLAND	OR
—	503-349	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR	5820	PORTLAND	OR
—	503-350	not yet reported which blocks →	ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER	4323	BEAVERTON	OR
—	503-351	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR	5820	PORTLAND	OR
—	503-352	4XXX5XXX9XXX which blocks →	ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM	7172	BEAVERTON	OR
—	503-353	not yet reported which blocks →	QWEST CORPORATION	9638	CLACKAMAS	OR
—	503-355	not yet reported which blocks →	UNITED TELEPHONE - NORTHWEST DBA CENTURYLINK - OR	4520	ROCKAWAY	OR
—	503-356	not yet reported which blocks →	ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER	4323	BEAVERTON	OR
—	503-357	not yet reported which blocks →	ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER	4323	BEAVERTON	OR
—	503-358	none assigned yet which blocks →	T-MOBILE USA, INC.	6529	PORTLAND	OR
—	503-359	not yet reported which blocks →	ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER	4323	BEAVERTON	OR
—	503-361	not yet reported which blocks →	QWEST CORPORATION	9638	SALEM	OR
—	503-362	not yet reported which blocks →	QWEST CORPORATION	9638	SALEM	OR
—	503-363	not yet reported which blocks →	QWEST CORPORATION	9638	SALEM	OR
—	503-364	not yet reported which blocks →	QWEST CORPORATION	9638	SALEM	OR
—	503-365	not yet reported which blocks →	QWEST CORPORATION	9638	SALEM	OR

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 10/01/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.