Recent prefix assignments

1 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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 — NPA 503

ONVOY, LLC - OR 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

Recent NPA-NXX prefix assignments
Assigned	NPA-NXX	Thousands-blocks taken (last-4 opening)	Code holder	OCN	Rate center	State
2006-08-17	503-867	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR	5820	PORTLAND	OR
2006-08-08	503-724	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	PORTLAND	OR
2006-08-08	503-928	0–9 XXXall 10 · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	PORTLAND	OR
2006-07-28	503-839	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	PORTLAND	OR
2006-07-28	503-933	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	PORTLAND	OR
2006-07-20	503-875	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	PORTLAND	OR
2006-03-13	503-206	0–9 XXXall 10 · 4 holders which blocks →	ONVOY, LLC - OR	750E	PORTLAND	OR
2006-02-24	503-853	0–9 XXXall 10 · 4 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR	5820	PORTLAND	OR
2006-02-22	503-898	0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	BEAVER CREEK COOPERATIVE TELEPHONE COMPANY - OR	461J	REDLAND	OR
2006-01-12	503-927	0–9 XXXall 10 · 2 holders which blocks →	T-MOBILE USA, INC.	6529	PORTLAND	OR
2005-12-08	503-987	0–9 XXXall 10 · 5 holders which blocks →	COMCAST IP PHONE, LLC	318J	SCAPPOOSE	OR
2005-11-14	503-593	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR	5820	PORTLAND	OR
2005-11-03	503-929	0–9 XXXwhole prefix which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	PORTLAND	OR
2005-10-21	503-841	0–9 XXXall 10 · 4 holders which blocks →	T-MOBILE USA, INC.	6529	PORTLAND	OR
2005-10-12	503-764	0–9 XXXall 10 · 6 holders which blocks →	ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM	7172	PORTLAND	OR
2005-09-22	503-545	0–9 XXXall 10 · 3 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR	5820	PORTLAND	OR
2005-09-12	503-934	0–9 XXXwhole prefix which blocks →	QWEST CORPORATION	9638	SALEM	OR
2005-08-16	503-758	0–9 XXXall 10 · 2 holders which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR	5820	PORTLAND	OR
2005-06-14	503-956	0–9 XXXwhole prefix which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR	5820	PORTLAND	OR
2005-05-18	503-922	0–9 XXXall 10 · 6 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	PORTLAND	OR
2005-02-09	503-782	1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - OR	3234	PACIFIC CY	OR
2005-01-28	503-564	0XXX1XXX3XXX4XXX7XXX8XXX9XXX · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - OR	3234	HOOD LAND	OR
2005-01-26	503-442	0–9 XXXwhole prefix which blocks →	T-MOBILE USA, INC.	6529	PORTLAND	OR
2004-12-08	503-367	0–9 XXXall 10 · 2 holders which blocks →	NEW CINGULAR WIRELESS PCS, LLC	6010	PORTLAND	OR
2004-10-04	503-336	0–9 XXXall 10 · 4 holders which blocks →	COMCAST IP PHONE, LLC	318J	BEAVERTON	OR
2004-09-17	503-664	0–9 XXXall 10 · 7 holders which blocks →	T-MOBILE USA, INC.	6529	BEAVER	OR
2004-08-13	503-609	0XXX1XXX7XXX9XXX · 4 holders which blocks →	BANDWIDTH.COM CLEC, LLC - OR	076F	CORBETT	OR
2004-04-06	503-483	1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - OR	3234	PACIFIC CY	OR
2003-05-19	503-562	0–9 XXXall 10 · 3 holders which blocks →	ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM	7172	SALEM	OR
2002-09-20	503-354	0–9 XXXall 10 · 7 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - OR	3234	TILLAMOOK	OR
2002-07-25	503-298	0–9 XXXall 10 · 5 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - OR	3234	ASTORIA	OR
2002-06-17	503-374	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - OR	3234	TILLAMOOK	OR
2002-04-25	503-459	1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks →	LEVEL 3 TELECOM OF OREGON, LLC - OR	7537	PORTLAND	OR
2002-02-07	503-468	0–9 XXXall 10 · 6 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - OR	3234	ASTORIA	OR
2001-12-03	503-470	1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks →	T-MOBILE USA, INC.	6529	SEASIDE	OR
2001-05-08	503-836	2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks →	LEVEL 3 COMMUNICATIONS, LLC - OR	3234	ASTORIA	OR
—	503-201	not yet reported which blocks →	CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OR	5820	PORTLAND	OR
—	503-202	not yet reported which blocks →	SPOK, INC.	6630	PORTLAND	OR
—	503-203	not yet reported which blocks →	QWEST CORPORATION	9638	PORTLAND	OR
—	503-204	not yet reported which blocks →	SPOK, INC.	6630	PORTLAND	OR
—	503-205	not yet reported which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	PORTLAND	OR
—	503-207	3XXX5XXX6XXX8XXX · 4 holders which blocks →	MCIMETRO ACCESS TRANSMISSION SERVICES LLC	7229	BEAVERTON	OR
—	503-209	none assigned yet which blocks →	T-MOBILE USA, INC.	6529	PORTLAND	OR
—	503-210	2XXX3XXX4XXX5XXX · 2 holders which blocks →	ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM	7172	CLACKAMAS	OR
—	503-211	not yet reported which blocks →	MULTIPLE OCN LISTING	MULT	XXXXXXXXXX	OR
—	503-212	3XXX4XXX · 2 holders which blocks →	ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM	7172	CLACKAMAS	OR
—	503-213	0XXX1XXX3XXX4XXX · 3 holders which blocks →	ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM	7172	BEAVERTON	OR
—	503-214	0XXX1XXX2XXX3XXX4XXX · 3 holders which blocks →	ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM	7172	BEAVERTON	OR
—	503-215	not yet reported which blocks →	QWEST CORPORATION	9638	PORTLAND	OR
—	503-216	not yet reported which blocks →	QWEST CORPORATION	9638	PORTLAND	OR

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.