NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

0 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, all time — NPA 206
QWEST CORPORATION 243
T-MOBILE USA, INC. 95
ONVOY, LLC - WA 72
NEW CINGULAR WIRELESS PCS, LLC 58
CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 57
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
2017-06-09 206-480 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2017-04-04 206-887 0–9 XXXall 10 · 3 holders which blocks → PEERLESS NETWORK OF WASHINGTON, LLC - WA 159F BAINBDG IS WA
2017-03-15 206-620 0–9 XXXall 10 · 4 holders which blocks → VONAGE AMERICA LLC 197D SEATTLE WA
2017-03-13 206-751 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2016-12-21 206-712 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 SEATTLE WA
2016-11-21 206-503 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2016-11-16 206-502 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF WASHINGTON, LLC - WA 159F BAINBDG IS WA
2016-09-08 206-785 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF WASHINGTON, LLC - WA 159F SEATTLE WA
2016-08-18 206-573 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
2016-08-18 206-646 0–9 XXXwhole prefix which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2016-08-18 206-773 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2016-08-10 206-698 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2016-06-27 206-487 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
2016-05-24 206-483 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2016-05-05 206-481 0–9 XXXwhole prefix which blocks → QWEST CORPORATION 9638 SEATTLE WA
2016-05-04 206-565 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - WA 483E BAINBDG IS WA
2016-04-01 206-606 0–9 XXXall 10 · 3 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 SEATTLE WA
2016-03-25 206-717 0–9 XXXall 10 · 7 holders which blocks → ONVOY, LLC - WA 483E SEATTLE WA
2016-03-10 206-460 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - WA 483E DES MOINES WA
2016-03-10 206-472 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - WA 483E SEATTLE WA
2016-03-10 206-485 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - WA 006F SEATTLE WA
2016-03-10 206-929 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - WA 006F DES MOINES WA
2016-03-08 206-401 0–9 XXXall 10 · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 RICHMNDBCH WA
2016-03-07 206-771 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2016-01-21 206-482 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE WA
2016-01-15 206-413 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SEATTLE WA
2016-01-15 206-823 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BAINBDG IS WA
2015-11-25 206-775 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - WA 483E SEATTLE WA
2015-11-19 206-207 0–9 XXXwhole prefix which blocks → ONVOY, LLC - WA 483E SEATTLE WA
2015-11-06 206-899 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 BAINBDG IS WA
2015-09-30 206-539 0–9 XXXall 10 · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SEATTLE WA
2015-09-25 206-492 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SEATTLE WA
2015-09-25 206-960 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2015-09-24 206-475 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE WA
2015-08-27 206-637 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2015-08-20 206-630 0–9 XXXwhole prefix which blocks → QWEST CORPORATION 9638 SEATTLE WA
2015-07-29 206-668 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SEATTLE WA
2015-06-17 206-900 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - WA 483E SEATTLE WA
2015-03-12 206-822 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BAINBDG IS WA
2014-12-04 206-966 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 DES MOINES WA
2014-10-22 206-693 0–9 XXXall 10 · 5 holders which blocks → PAETEC ITEL, LLC 829J SEATTLE WA
2014-10-22 206-739 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE WA
2014-10-09 206-488 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BAINBDG IS WA
2014-10-08 206-800 0–9 XXXall 10 · 6 holders which blocks → PEERLESS NETWORK OF WASHINGTON, LLC - WA 159F RICHMNDBCH WA
2014-09-26 206-886 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE WA
2014-09-24 206-476 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 SEATTLE WA
2014-09-18 206-379 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
2014-09-08 206-468 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2014-08-19 206-471 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
2014-07-03 206-519 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE 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.