NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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, all time — NPA 253
QWEST CORPORATION 141
T-MOBILE USA, INC. 77
ONVOY, LLC - WA 49
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 48
NEW CINGULAR WIRELESS PCS, LLC 35
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 NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2012-03-05 253-888 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF WASHINGTON, LLC - WA 159F TACOMA WA
2012-01-09 253-442 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TACOMA WA
2011-08-09 253-283 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 TACOMA WA
2011-08-02 253-448 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 TACOMA WA
2011-07-22 253-329 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 AUBURN WA
2011-03-25 253-348 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 TACOMA WA
2010-01-14 253-358 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 GIG HARBOR WA
2010-01-12 253-432 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 GIG HARBOR WA
2009-01-27 253-363 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 TACOMA WA
2008-07-07 253-365 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 TACOMA WA
2008-06-17 253-293 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 AUBURN WA
2008-02-22 253-355 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 TACOMA WA
2008-02-15 253-327 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 TACOMA WA
2007-10-08 253-326 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 AUBURN WA
2007-10-05 253-324 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 TACOMA WA
2007-05-03 253-282 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 TACOMA WA
2007-05-03 253-292 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J TACOMA WA
2007-03-14 253-314 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 TACOMA WA
2007-01-04 253-301 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J TACOMA WA
2006-07-14 253-330 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 TACOMA WA
2006-06-15 253-507 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 TACOMA WA
2006-06-13 253-353 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 TACOMA WA
2006-01-20 253-298 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 TACOMA WA
2005-10-05 253-304 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 TACOMA WA
2005-02-18 253-215 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J ROY WA
2004-10-29 253-495 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 TACOMA WA
2003-02-04 253-267 2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J TACOMA WA
2003-02-04 253-268 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → COMCAST IP PHONE, LLC 318J PUYALLUP WA
2003-02-04 253-271 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J GRAHAM WA
2003-02-04 253-277 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J KENT WA
2003-01-28 253-245 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - WA 006F AUBURN WA
2003-01-28 253-246 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 KENT WA
2003-01-28 253-252 0–9 XXXall 10 · 4 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 TACOMAWVLY WA
2003-01-28 253-254 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 TACOMA WA
2003-01-28 253-256 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 PUYALLUP WA
2003-01-07 253-299 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 SUMNER WA
2002-12-17 253-944 1XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9638 TACOMAWVLY WA
2002-12-10 253-200 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 PUYALLUP WA
2002-09-12 253-880 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 AUBURN WA
2002-09-12 253-881 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 PUYALLUP WA
2002-09-12 253-882 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 TACOMA WA
2002-09-12 253-883 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 TACOMAWVLY WA
2002-08-27 253-235 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 TACOMAWVLY WA
2002-08-27 253-236 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 KENT WA
2002-08-26 253-928 not yet reported which blocks → QWEST CORPORATION 9638 TACOMAWVLY WA
2002-06-20 253-255 3XXX4XXX which blocks → T-MOBILE USA, INC. 6529 TACOMA WA
2002-03-12 253-336 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 DES MOINES WA
2002-03-07 253-266 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 AUBURN WA
2002-02-21 253-655 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 GRAHAM WA
2002-02-21 253-656 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 KENT WA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.