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
2002-04-16 509-844 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → INTRADO COMMUNICATIONS, LLC 841C SPOKANE WA
2002-04-04 509-398 4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 EPHRATA WA
2002-04-04 509-557 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 OMAK WA
2002-04-04 509-560 0XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 OROVILLE WA
2002-04-04 509-563 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 COLVILLE WA
2002-04-04 509-566 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 POMEROY WA
2002-03-25 509-237 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 EPHRATA WA
2002-03-14 509-587 0XXX1XXX2XXX4XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BREWSTER WA
2002-02-07 509-288 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 COLFAX WA
2001-12-14 509-260 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 CLE ELUM WA
2001-12-11 509-204 4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - WA 483E WALLAWALLA WA
2001-12-11 509-537 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - WA 483E PASCO WA
2001-12-11 509-581 7XXX8XXX9XXX which blocks → ONVOY, LLC - WA 483E KENNEWICK WA
2001-12-11 509-940 5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - WA 483E RICHLAND WA
2001-12-11 509-955 7XXX8XXX9XXX which blocks → ONVOY, LLC - WA 483E YAKIMA WA
2001-12-05 509-362 9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SPOKANE WA
2001-11-07 509-871 6XXX7XXX8XXX · 2 holders which blocks → ONVOY, LLC - WA 483E OROVILLE WA
2001-10-29 509-390 1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → ELTOPIA COMMUNICATIONS, LLC - WA 663D SOAP LAKE WA
2001-10-29 509-620 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → ONVOY, LLC - WA 483E COULEE DAM WA
2001-09-28 509-460 2XXX3XXX4XXX5XXX6XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 KENNEWICK WA
2001-09-28 509-741 1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 WENATCHEE WA
2001-09-07 509-247 not yet reported which blocks → LEVEL 3 TELECOM OF WASHINGTON, LLC - WA 7455 SPOKANE WA
2001-09-04 509-431 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 MOSES LAKE WA
2001-08-31 509-294 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SPOKANE WA
2001-07-30 509-570 2XXX3XXX4XXX6XXX8XXX which blocks → PAETEC ITEL, LLC 829J SPOKANE WA
2001-07-17 509-717 2XXX3XXX4XXX7XXX8XXX · 5 holders which blocks → COMPUTERS 5*, INC. DBA LOCALTEL - WA 3229 EPHRATA WA
2001-07-11 509-312 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 ELLENSBURG WA
2001-05-03 509-707 2XXX3XXX6XXX8XXX9XXX · 3 holders which blocks → COMPUTERS 5*, INC. DBA LOCALTEL - WA 3229 MOSES LAKE WA
2001-03-19 509-888 not yet reported which blocks → COMPUTERS 5*, INC. DBA LOCALTEL - WA 3229 WENATCHEE WA
2001-01-30 509-216 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SPOKANE WA
2001-01-30 509-217 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SPOKANE WA
2001-01-30 509-218 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SPOKANE WA
2001-01-26 509-556 not yet reported which blocks → SKYLINE TELECOM COMPANY - WA 581D MT HULL WA
— 509-200 none assigned yet which blocks → T-MOBILE USA, INC. 6529 WALLAWALLA WA
— 509-201 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K ELLENSBURG WA
— 509-202 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 551G SPOKANE WA
— 509-210 not yet reported which blocks → ONVOY, LLC - WA 483E LIBERTY LK WA
— 509-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WA
— 509-213 0–9 XXXall 10 · 2 holders which blocks → AT&T - LOCAL 7421 SPRINGDALE WA
— 509-214 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - WA 483E NEWMANLAKE WA
— 509-220 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SPOKANE WA
— 509-222 0XXX4XXX8XXX9XXX which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KENNEWICK WA
— 509-223 0XXX1XXX2XXX4XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4423 LOOMIS WA
— 509-225 0XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9638 YAKIMA WA
— 509-226 none assigned yet which blocks → QWEST CORPORATION 9638 NEWMANLAKE WA
— 509-227 9XXX which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-228 1XXX2XXX3XXX7XXX8XXX · 3 holders which blocks → QWEST CORPORATION 9638 SPOKANE WA
— 509-229 5XXX7XXX9XXX · 3 holders which blocks → INLAND TEL CO 2423 UNIONTOWN WA
— 509-230 not yet reported which blocks → T-MOBILE USA, INC. 6529 SPOKANE WA
— 509-231 0–9 XXXall 10 · 7 holders which blocks → ONVOY, LLC - WA 483E KENNEWICK 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.