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
Clear Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
— 206-792 5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → XO WASHINGTON, INC. 7340 SEATTLE WA
— 206-793 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-794 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
— 206-795 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
— 206-797 4XXX5XXX6XXX7XXX8XXX9XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-799 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
— 206-801 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 RICHMNDBCH WA
— 206-802 4XXX5XXX8XXX · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - WA 7274 SEATTLE WA
— 206-803 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - WA 483E BAINBDG IS WA
— 206-805 9XXX which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 SEATTLE WA
— 206-808 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-809 0–9 XXXall 10 · 4 holders which blocks → TELNYX LLC 073H SEATTLE WA
— 206-810 not yet reported which blocks → SPOK, INC. 6630 SEATTLE WA
— 206-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX WA
— 206-812 not yet reported which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 SEATTLE WA
— 206-816 0XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 2 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 SEATTLE WA
— 206-817 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
— 206-818 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
— 206-819 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 SEATTLE WA
— 206-824 not yet reported which blocks → QWEST CORPORATION 9638 DES MOINES WA
— 206-826 not yet reported which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SEATTLE WA
— 206-829 0XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 SEATTLE WA
— 206-830 0XXX8XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - WA 7146 SEATTLE WA
— 206-832 5XXX6XXX7XXX9XXX which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SEATTLE WA
— 206-835 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-838 9XXX which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 SEATTLE WA
— 206-839 6XXX7XXX which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-841 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-842 not yet reported which blocks → QWEST CORPORATION 9638 BAINBDG IS WA
— 206-849 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE WA
— 206-850 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-851 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-852 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-853 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-854 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-855 3XXX5XXX6XXX which blocks → QWEST CORPORATION 9638 BAINBDG IS WA
— 206-856 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-860 not yet reported which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-861 2XXX3XXX4XXX5XXX6XXX9XXX · 2 holders which blocks → QWEST CORPORATION 9638 SEATTLE WA
— 206-866 1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BAINBDG IS WA
— 206-870 not yet reported which blocks → QWEST CORPORATION 9638 DES MOINES WA
— 206-875 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - WA 483E VASHON WA
— 206-876 0XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 TELECOM OF WASHINGTON, LLC - WA 7455 SEATTLE WA
— 206-877 1XXX2XXX3XXX4XXX · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SEATTLE WA
— 206-878 not yet reported which blocks → QWEST CORPORATION 9638 DES MOINES WA
— 206-883 3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 SEATTLE WA
— 206-888 0XXX1XXX3XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - WA 483E SEATTLE WA
— 206-890 not yet reported which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SEATTLE WA
— 206-895 0–9 XXXall 10 · 2 holders which blocks → TWILIO INTERNATIONAL, INC. 506J SEATTLE WA
— 206-897 not yet reported which blocks → QWEST CORPORATION 9638 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.