NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

2 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, last 30 days — NPA 564
T-MOBILE USA, INC. 1
LTE WIRELESS INC. 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
2026-09-08 564-268 8XXX9XXX which blocks → T-MOBILE USA, INC. 6529 MT VERNON WA
2026-09-04 564-400 0XXX which blocks → LTE WIRELESS INC. 498M VANCOUVER WA
2026-07-02 564-267 0XXX which blocks → ACCELERATE NETWORKS LLC 147L CAMAS WA
2025-12-05 564-265 0XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 LONGVIEW WA
2025-12-05 564-266 0XXX1XXX3XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 VANCOUVER WA
2025-08-15 564-263 0XXX1XXX2XXX3XXX4XXX6XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 OLYMPIA WA
2025-07-03 564-261 0XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 BELFAIR WA
2025-06-05 564-247 0XXX9XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 CENTRALIA WA
2025-02-07 564-246 8XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 PT ROBERTS WA
2024-12-09 564-274 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 VANCOUVER WA
2024-12-09 564-549 0XXX1XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 OAK HARBOR WA
2024-09-16 564-260 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 MT VERNON WA
2024-08-16 564-259 0XXX1XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 ABERDEEN WA
2024-02-16 564-258 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 VANCOUVER WA
2024-01-09 564-252 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 BREMERTON WA
2024-01-09 564-253 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 BREMERTON WA
2024-01-09 564-254 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 BREMERTON WA
2024-01-09 564-255 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 BREMERTON WA
2024-01-09 564-256 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 BREMERTON WA
2024-01-09 564-257 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 BREMERTON WA
2024-01-05 564-251 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 BREMERTON WA
2024-01-02 564-250 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 OLYMPIA WA
2023-11-27 564-249 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 MARYSVILLE WA
2023-11-06 564-248 0–9 XXXwhole prefix which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 VANCOUVER WA
2023-09-26 564-245 0XXX1XXX2XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SILVERDALE WA
2023-09-19 564-243 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 WHATCOMCTY WA
2023-08-11 564-206 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 BREMERTON WA
2023-04-19 564-241 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 CAMAS WA
2023-04-18 564-239 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J LONGVIEW WA
2023-04-14 564-236 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - WA 483E VANCOUVER WA
2023-04-14 564-237 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 VANCOUVER WA
2023-04-07 564-645 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - WA 483E POULSBO WA
2023-03-17 564-231 2XXX8XXX9XXX · 3 holders which blocks → COMCAST IP PHONE, LLC 318J SOUTH BEND WA
2023-03-01 564-230 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BREMERTON WA
2023-01-23 564-238 0XXX2XXX3XXX4XXX5XXX9XXX · 3 holders which blocks → ONVOY, LLC - WA 483E PORT ORCH WA
2023-01-23 564-242 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - WA 483E MARYSVILLE WA
2022-12-12 564-228 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 ABERDEEN WA
2022-11-16 564-565 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - WA 483E WHATCOMCTY WA
2022-11-15 564-226 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BREMERTON WA
2022-10-03 564-235 3XXX4XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 BUCKLEY WA
2022-10-03 564-262 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 LONGVIEW WA
2022-09-21 564-233 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - WA 006F OLYMPIA WA
2022-09-20 564-227 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 VANCOUVER WA
2022-09-20 564-264 2XXX3XXX4XXX7XXX8XXX which blocks → ONVOY, LLC - WA 483E CURTIS WA
2022-08-24 564-223 1XXX3XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J HAT ISLAND WA
2022-08-09 564-215 0XXX1XXX2XXX3XXX4XXX5XXX7XXX9XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 PT ANGELES WA
2022-06-07 564-224 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 ABERDEEN WA
2022-05-02 564-218 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BREMERTON WA
2022-05-02 564-221 0XXX2XXX3XXX4XXX7XXX8XXX9XXX · 6 holders which blocks → COMCAST IP PHONE, LLC 318J BATTLEGRND WA
2022-04-05 564-516 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → SALISH NETWORKS, INC. - WA 152H MARYSVILLE 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.