NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

1 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 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
2020-12-21 509-513 1XXX2XXX7XXX · 2 holders which blocks → ONVOY, LLC - WA 483E NORTHPORT WA
2020-11-03 509-602 0XXX1XXX5XXX · 3 holders which blocks → COMPUTERS 5*, INC. DBA LOCALTEL - WA 3229 CONNELL WA
2020-11-03 509-605 5XXX6XXX · 2 holders which blocks → COMPUTERS 5*, INC. DBA LOCALTEL - WA 3229 WILBUR WA
2020-10-27 509-512 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 MOSES LAKE WA
2020-10-23 509-601 0–9 XXXall 10 · 3 holders which blocks → TWILIO INTERNATIONAL, INC. 506J SPOKANE WA
2020-10-05 509-606 0–9 XXXall 10 · 2 holders which blocks → HD CARRIER LLC 321J SPOKANE WA
2020-09-23 509-506 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 YAKIMA WA
2020-09-16 509-403 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 QUINCY WA
2020-08-31 509-957 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 478J SPOKANE WA
2020-08-17 509-510 0–9 XXXall 10 · 4 holders which blocks → COMPUTERS 5*, INC. DBA LOCALTEL - WA 3229 OTHELLO WA
2020-08-17 509-519 1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 2 holders which blocks → COMPUTERS 5*, INC. DBA LOCALTEL - WA 3229 MATTAWA WA
2020-07-23 509-508 0–9 XXXall 10 · 5 holders which blocks → CSC WIRELESS, LLC 425J SPOKANE WA
2020-07-14 509-816 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H SPOKANE WA
2020-07-09 509-504 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 YAKIMA WA
2020-07-06 509-501 1XXX5XXX · 2 holders which blocks → COMPUTERS 5*, INC. DBA LOCALTEL - WA 3229 ODESSA WA
2020-07-02 509-450 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 EPHRATA WA
2020-06-12 509-410 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - WA 483E PASCO WA
2019-11-07 509-824 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - WA 006F SPOKANE WA
2019-11-06 509-409 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 QUINCY WA
2019-11-05 509-407 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 QUINCY WA
2019-09-18 509-418 0–9 XXXall 10 · 7 holders which blocks → EXIANT COMMUNICATIONS LLC 114J SPOKANE WA
2019-08-13 509-502 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SUNNYSIDE WA
2019-07-30 509-503 0–9 XXXall 10 · 5 holders which blocks → VOIP INNOVATIONS, LLC 597F SPOKANE WA
2019-06-20 509-905 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 PASCO WA
2019-06-19 509-401 0XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 POMEROY WA
2019-06-19 509-975 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 PASCO WA
2019-05-06 509-864 0XXX1XXX4XXX6XXX7XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 TOPPENISH WA
2019-03-12 509-666 0–9 XXXall 10 · 3 holders which blocks → COMMIO, LLC 939H SPOKANE WA
2019-02-25 509-900 0–9 XXXall 10 · 6 holders which blocks → TERRA NOVA TELECOM INC. 145J SPOKANE WA
2019-02-14 509-505 0–9 XXXall 10 · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - WA 006F SPOKANE WA
2019-01-31 509-408 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - WA 006F LIBERTY LK WA
2019-01-09 509-612 3XXX7XXX8XXX · 2 holders which blocks → ONVOY, LLC - WA 483E KETTLE FLS WA
2018-11-24 509-436 2XXX3XXX4XXX5XXX6XXX · 2 holders which blocks → COMPUTERS 5*, INC. DBA LOCALTEL - WA 3229 WENATCHEE WA
2018-11-06 509-530 0–9 XXXall 10 · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J SPOKANE WA
2018-10-19 509-873 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KENNEWICK WA
2018-08-22 509-827 0–9 XXXall 10 · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 RICHLAND WA
2018-07-19 509-400 0XXX1XXX2XXX4XXX5XXX6XXX · 3 holders which blocks → UNITED STATES CELLULAR - WA 6270 MATTAWA WA
2018-01-17 509-906 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 EPHRATA WA
2017-12-14 509-866 0–9 XXXall 10 · 8 holders which blocks → VONAGE AMERICA LLC 197D SPOKANE WA
2017-09-07 509-867 0–9 XXXall 10 · 5 holders which blocks → ONVOY SPECTRUM, LLC 624H SPOKANE WA
2017-08-24 509-644 0XXX1XXX2XXX3XXX6XXX7XXX8XXX · 4 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K LOON LAKE WA
2017-06-15 509-862 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SPOKANE WA
2016-12-07 509-904 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SPOKANE WA
2016-10-07 509-405 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 KENNEWICK WA
2016-08-01 509-558 0–9 XXXall 10 · 4 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 SPOKANE WA
2016-06-10 509-907 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 YAKIMA WA
2016-06-07 509-902 0–9 XXXall 10 · 7 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K YAKIMA WA
2016-04-29 509-608 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 SPOKANE WA
2016-03-23 509-596 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CLARKSTON WA
2016-03-08 509-890 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF WASHINGTON, LLC - WA 159F DEER PARK 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.