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 206
QWEST CORPORATION 243
T-MOBILE USA, INC. 95
ONVOY, LLC - WA 72
NEW CINGULAR WIRELESS PCS, LLC 58
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 57
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
2007-03-29 206-884 0–9 XXXwhole prefix which blocks → QWEST CORPORATION 9638 SEATTLE WA
2006-11-17 206-497 0XXX1XXX7XXX · 2 holders which blocks → ONVOY, LLC - WA 483E RICHMNDBCH WA
2006-10-10 206-473 0–9 XXXall 10 · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 SEATTLE WA
2006-09-21 206-451 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - WA 483E BAINBDG IS WA
2006-04-26 206-422 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE WA
2006-04-26 206-434 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE WA
2006-03-09 206-420 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - WA 483E SEATTLE WA
2005-01-05 206-257 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J SEATTLE WA
2004-09-01 206-259 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 VASHON WA
2004-01-30 206-744 0–9 XXXwhole prefix which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 SEATTLE WA
2004-01-27 206-245 0–9 XXXall 10 · 4 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 SEATTLE WA
2002-08-23 206-274 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2002-06-17 206-393 2XXX7XXX8XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 SEATTLE WA
2001-09-27 206-859 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 SEATTLE WA
2001-06-06 206-987 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
2001-04-23 206-212 0XXX1XXX4XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 DES MOINES WA
2001-04-23 206-266 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2001-04-23 206-268 none assigned yet which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 SEATTLE WA
2001-04-23 206-505 not yet reported which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 SEATTLE WA
2001-04-23 206-694 2XXX3XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 SEATTLE WA
2001-04-23 206-695 2XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 SEATTLE WA
2001-04-23 206-834 5XXX6XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 SEATTLE WA
2001-04-23 206-892 8XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 SEATTLE WA
2001-03-20 206-400 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 DES MOINES WA
2001-02-28 206-392 not yet reported which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 SEATTLE WA
2001-02-20 206-304 2XXX3XXX4XXX5XXX7XXX8XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 DES MOINES WA
2001-01-24 206-249 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 DES MOINES WA
2001-01-23 206-560 not yet reported which blocks → SPOK, INC. 6630 SEATTLE WA
— 206-200 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
— 206-201 0XXX1XXX2XXX3XXX4XXX9XXX · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 BAINBDG IS WA
— 206-202 not yet reported which blocks → ONVOY, LLC - WA 483E SEATTLE WA
— 206-203 not yet reported which blocks → ONVOY, LLC - WA 483E SEATTLE WA
— 206-204 8XXX which blocks → PAETEC ITEL, LLC 829J SEATTLE WA
— 206-205 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-208 not yet reported which blocks → ONVOY, LLC - WA 483E SEATTLE WA
— 206-210 not yet reported which blocks → ONVOY, LLC - WA 483E SEATTLE WA
— 206-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WA
— 206-213 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-214 5XXX6XXX7XXX8XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-215 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-216 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-217 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-218 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-219 none assigned yet which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
— 206-220 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-221 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-222 not yet reported which blocks → ONVOY, LLC - WA 483E SEATTLE WA
— 206-223 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-224 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-225 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE 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.