NumberResearch Membership · Data 09/19/2026

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 509
NEW CINGULAR WIRELESS PCS, 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 NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2007-08-03 509-413 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - WA 483E SPOKANE WA
2007-07-26 509-497 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - WA 483E BENTONCITY WA
2007-05-10 509-584 0–9 XXXall 10 · 4 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K WAPATO WA
2007-04-26 509-515 0–9 XXXall 10 · 6 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K SUNNYSIDE WA
2007-04-03 509-315 0–9 XXXall 10 · 4 holders which blocks → ELTOPIA COMMUNICATIONS, LLC - WA 663D SPOKANE WA
2007-03-05 509-380 0–9 XXXall 10 · 3 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K PASCO WA
2007-03-05 509-619 0–9 XXXall 10 · 5 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K KENNEWICK WA
2006-03-09 509-385 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - WA 483E SPOKANE WA
2005-09-21 509-414 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → COMCAST IP PHONE, LLC 318J ELK-GRNBLF WA
2005-08-29 509-621 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J NEWMANLAKE WA
2005-02-22 509-676 0–9 XXXall 10 · 6 holders which blocks → TELEWISE, LLC - WA 4718 WALLAWALLA WA
2005-01-12 509-480 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 YAKIMA WA
2004-09-20 509-215 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 DAVENPORT WA
2004-08-27 509-209 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 TELECOM OF WASHINGTON, LLC - WA 7455 SPOKANE WA
2004-08-13 509-207 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 REPUBLIC WA
2004-06-14 509-320 0XXX2XXX3XXX4XXX7XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 STARBUCK WA
2004-05-05 509-219 0–9 XXXall 10 · 7 holders which blocks → AXXIS COMMUNICATION, INC. - WA 5844 STEVENSON WA
2004-03-25 509-481 0–9 XXXall 10 · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SPOKANE WA
2003-10-31 509-956 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 WALLAWALLA WA
2003-07-16 509-885 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 WENATCHEE WA
2003-06-19 509-318 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 CONNELL WA
2003-06-18 509-387 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 WENATCHEE WA
2003-02-20 509-205 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 KENNEWICK WA
2003-01-07 509-203 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 GRANDVIEW WA
2002-12-04 509-699 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → WESTGATE COMMUNICATIONS, LLC DBA WEAVTEL - WA 580D WENATCHEE WA
2002-10-18 509-383 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 GRANGER WA
2002-09-24 509-347 0XXX3XXX6XXX7XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 RITZVILLE WA
2002-09-24 509-348 0XXX1XXX2XXX4XXX5XXX7XXX · 2 holders which blocks → INLAND CELLULAR LLC 1477 DAVENPORT WA
2002-09-19 509-643 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SUNNYSIDE WA
2002-09-11 509-977 1XXX2XXX4XXX7XXX9XXX · 4 holders which blocks → INLAND CELLULAR LLC 1477 CRESTON WA
2002-09-11 509-978 1XXX2XXX3XXX4XXX6XXX7XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 NESPELEM WA
2002-09-11 509-983 7XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 STARBUCK WA
2002-08-05 509-589 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 NEWPORT WA
2002-07-23 509-551 7XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KENNEWICK WA
2002-07-23 509-554 3XXX4XXX5XXX7XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 RICHLAND WA
2002-07-17 509-855 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 MOSES LAKE WA
2002-06-14 509-240 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 WALLAWALLA WA
2002-06-12 509-774 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 WH SALMON WA
2002-06-12 509-776 6XXX7XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 COLUMBIA WA
2002-06-12 509-778 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 PROSSER WA
2002-06-10 509-438 none assigned yet which blocks → T-MOBILE USA, INC. 6529 KENNEWICK WA
2002-05-31 509-250 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 GOLDENDALE WA
2002-05-31 509-637 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 WH SALMON WA
2002-05-16 509-330 5XXX6XXX · 2 holders which blocks → INLAND CELLULAR LLC 1484 PULLMAN WA
2002-05-07 509-590 0–9 XXXall 10 · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SPOKANE WA
2002-05-07 509-591 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 KENNEWICK WA
2002-05-07 509-593 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 WALLAWALLA WA
2002-05-07 509-594 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 YAKIMA WA
2002-04-30 509-833 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 YAKIMA WA
2002-04-30 509-845 5XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PASCO WA

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.