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
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2016-02-09 509-417 0XXX2XXX4XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 WARDEN WA
2016-01-15 509-934 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SPOKANE WA
2015-09-25 509-960 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - WA 483E SPOKANE WA
2015-09-16 509-600 0XXX1XXX2XXX3XXX6XXX · 3 holders which blocks → ONVOY, LLC - WA 483E BRIDGEPORT WA
2015-02-13 509-841 0XXX1XXX2XXX3XXX4XXX9XXX · 2 holders which blocks → PEERLESS NETWORK OF WASHINGTON, LLC - WA 159F WAITSBURG WA
2015-01-15 509-404 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J DAYTON WA
2015-01-15 509-903 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 LIBERTY LK WA
2015-01-06 509-913 0–9 XXXall 10 · 3 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J OTHELLO WA
2014-12-01 509-598 0–9 XXXall 10 · 6 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 SPOKANE WA
2014-11-30 509-319 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF WASHINGTON, LLC - WA 159F SPOKANE WA
2014-10-31 509-317 0–9 XXXall 10 · 7 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J YAKIMA WA
2014-10-30 509-316 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - WA 006F PASCO WA
2014-09-18 509-655 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SPOKANE WA
2014-09-18 509-820 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 KENNEWICK WA
2014-07-13 509-638 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SPOKANE WA
2014-07-03 509-367 0–9 XXXall 10 · 6 holders which blocks → METROPCS, INC. 5562 YAKIMA WA
2014-04-11 509-423 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 WENATCHEE WA
2014-03-05 509-309 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - WA 483E SPOKANE WA
2013-12-18 509-571 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 YAKIMA WA
2013-10-22 509-792 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 PASCO WA
2013-09-13 509-567 0–9 XXXall 10 · 6 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K PASCO WA
2013-09-13 509-919 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SPOKANE WA
2013-08-07 509-221 0–9 XXXall 10 · 3 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KENNEWICK WA
2013-07-23 509-212 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 KENNEWICK WA
2013-05-02 509-578 0–9 XXXall 10 · 7 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 RICHLAND WA
2012-12-17 509-379 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 YAKIMA WA
2012-12-14 509-740 0–9 XXXall 10 · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 OMAK WA
2012-06-13 509-821 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 DEER PARK WA
2012-05-03 509-424 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 YAKIMA WA
2012-03-22 509-491 0–9 XXXall 10 · 7 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 KENNEWICK WA
2011-12-16 509-822 0–9 XXXall 10 · 8 holders which blocks → ONVOY, LLC - WA 483E SPOKANE WA
2011-11-16 509-412 0–9 XXXall 10 · 7 holders which blocks → METROPCS, INC. 5562 PASCO WA
2011-10-19 509-724 0–9 XXXall 10 · 4 holders which blocks → QWEST CORPORATION 9638 SPOKANE WA
2011-08-22 509-808 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SPOKANE WA
2011-03-07 509-759 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 YAKIMA WA
2010-06-04 509-828 0–9 XXXall 10 · 4 holders which blocks → QWEST CORPORATION 9638 SPOKANE WA
2010-02-23 509-795 0–9 XXXall 10 · 6 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 SPOKANE WA
2009-06-08 509-426 0–9 XXXall 10 · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 YAKIMA WA
2009-05-27 509-440 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 KENNEWICK WA
2009-03-16 509-406 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 YAKIMA WA
2008-10-23 509-731 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 YAKIMA WA
2008-08-29 509-713 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 RICHLAND WA
2008-07-09 509-720 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SPOKANE WA
2008-06-18 509-850 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - WA 006F SPOKANE WA
2008-06-10 509-723 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - WA 483E SPOKANE WA
2008-03-27 509-313 0–9 XXXwhole prefix which blocks → QWEST CORPORATION 9638 SPOKANE WA
2008-03-06 509-730 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 WALLAWALLA WA
2008-02-25 509-580 0XXX1XXX2XXX4XXX6XXX7XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SELAH WA
2008-02-22 509-823 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 YAKIMA WA
2008-02-21 509-415 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 WENATCHEE 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.