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
2021-01-27 206-970 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - WA 483E SEATTLE WA
2021-01-19 206-656 0–9 XXXwhole prefix which blocks → ONVOY, LLC - WA 483E SEATTLE WA
2020-12-30 206-649 0–9 XXXwhole prefix which blocks → ONVOY, LLC - WA 483E SEATTLE WA
2020-11-11 206-677 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
2020-10-23 206-644 0–9 XXXwhole prefix which blocks → COMCAST IP PHONE, LLC 318J SEATTLE WA
2020-10-23 206-657 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 SEATTLE WA
2020-09-29 206-672 0–9 XXXwhole prefix which blocks → ONVOY, LLC - WA 483E SEATTLE WA
2020-08-20 206-590 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - WA 006F SEATTLE WA
2020-07-13 206-635 0–9 XXXall 10 · 6 holders which blocks → CSC WIRELESS, LLC 425J SEATTLE WA
2020-06-15 206-614 0–9 XXXwhole prefix which blocks → ONVOY, LLC - WA 483E SEATTLE WA
2020-05-29 206-558 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - WA 483E BAINBDG IS WA
2020-05-29 206-589 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - WA 483E RICHMNDBCH WA
2020-05-04 206-990 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 SEATTLE WA
2020-04-22 206-594 0–9 XXXall 10 · 2 holders which blocks → NUSO, LLC 478J SEATTLE WA
2020-04-07 206-593 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
2020-04-01 206-705 0–9 XXXall 10 · 5 holders which blocks → PAETEC ITEL, LLC 829J SEATTLE WA
2020-03-26 206-561 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
2020-03-26 206-627 0–9 XXXall 10 · 7 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 DES MOINES WA
2019-11-11 206-572 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
2019-11-04 206-580 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2019-10-24 206-514 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
2019-09-30 206-586 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2019-08-20 206-537 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BAINBDG IS WA
2019-08-08 206-798 0–9 XXXall 10 · 2 holders which blocks → EXIANT COMMUNICATIONS LLC 114J SEATTLE WA
2019-07-30 206-741 0–9 XXXall 10 · 4 holders which blocks → VOIP INNOVATIONS, LLC 597F SEATTLE WA
2019-05-20 206-591 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BAINBDG IS WA
2019-04-25 206-385 0–9 XXXwhole prefix which blocks → ONVOY, LLC - WA 483E SEATTLE WA
2019-04-22 206-688 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2019-04-16 206-806 0–9 XXXall 10 · 6 holders which blocks → HD CARRIER LLC 321J SEATTLE WA
2019-04-03 206-562 0–9 XXXwhole prefix which blocks → IP HORIZON LLC 515J SEATTLE WA
2019-03-07 206-867 0–9 XXXall 10 · 3 holders which blocks → COMMIO, LLC 939H SEATTLE WA
2019-02-12 206-584 0–9 XXXall 10 · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2019-02-06 206-640 0–9 XXXall 10 · 3 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 SEATTLE WA
2019-01-23 206-530 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2019-01-09 206-825 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - WA 483E BAINBDG IS WA
2018-11-20 206-833 0–9 XXXall 10 · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SEATTLE WA
2018-10-05 206-513 0–9 XXXall 10 · 5 holders which blocks → AIRESPRING, INC. 996H SEATTLE WA
2018-09-20 206-665 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
2018-08-30 206-507 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
2018-06-25 206-636 0–9 XXXall 10 · 3 holders which blocks → ADVANCED TELECOM SOLUTIONS, LLC 181J SEATTLE WA
2018-04-23 206-531 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2017-11-08 206-880 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE WA
2017-10-24 206-702 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 SEATTLE WA
2017-10-19 206-945 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 SEATTLE WA
2017-09-14 206-742 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 DES MOINES WA
2017-09-07 206-536 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - WA 483E SEATTLE WA
2017-08-24 206-247 0–9 XXXall 10 · 3 holders which blocks → PAETEC ITEL, LLC 829J SEATTLE WA
2017-07-17 206-928 0–9 XXXall 10 · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H SEATTLE WA
2017-06-23 206-889 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
2017-06-13 206-231 0–9 XXXall 10 · 6 holders which blocks → QWEST CORPORATION 9638 DES MOINES 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.