NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 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, all time — NPA 425
ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 122
T-MOBILE USA, INC. 91
QWEST CORPORATION 69
LEVEL 3 COMMUNICATIONS, LLC - WA 49
NEW CINGULAR WIRELESS PCS, LLC 44
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
2016-10-17 425-588 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KIRKLAND WA
2016-09-19 425-659 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 BOTHELL WA
2016-08-31 425-362 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2016-06-29 425-616 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - WA 006F HALLS LAKE WA
2016-05-23 425-690 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 RENTON WA
2016-05-12 425-240 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2016-05-04 425-215 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - WA 483E BOTHELL WA
2016-03-10 425-230 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - WA 006F BELLEVUE WA
2016-02-09 425-553 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J KIRKLAND WA
2016-01-20 425-426 0–9 XXXall 10 · 5 holders which blocks → WIDE VOICE, LLC - WA 707G EVERETT WA
2016-01-15 425-626 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 EVERETT WA
2015-12-03 425-375 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BOTHELL WA
2015-11-16 425-599 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 HALLS LAKE WA
2015-10-15 425-365 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2015-07-09 425-598 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J BELLEVUE WA
2015-06-23 425-979 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KIRKLAND WA
2015-02-13 425-689 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - WA 483E AMES LAKE WA
2014-10-20 425-287 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 BOTHELL WA
2014-10-01 425-236 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BOTHELL WA
2014-09-30 425-559 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J BELLEVUE WA
2014-09-23 425-595 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 EVERETT WA
2014-09-18 425-309 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 EVERETT WA
2014-08-29 425-499 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2014-06-27 425-229 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2014-06-17 425-219 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 BOTHELL WA
2014-05-01 425-305 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 KIRKLAND WA
2014-03-06 425-326 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2013-04-15 425-209 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2013-02-25 425-363 0–9 XXXall 10 · 7 holders which blocks → CENTURYTEL OF WASHINGTON, INC. DBA CENTURYLINK 2408 NORTH BEND WA
2012-10-24 425-324 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BELLEVUE WA
2012-10-18 425-435 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2012-03-05 425-777 0–9 XXXall 10 · 7 holders which blocks → PEERLESS NETWORK OF WASHINGTON, LLC - WA 159F BELLEVUE WA
2012-01-24 425-628 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BELLEVUE WA
2011-08-17 425-615 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BELLEVUE WA
2011-08-10 425-429 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 BELLEVUE WA
2011-06-22 425-366 0–9 XXXall 10 · 6 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 EVERETT WA
2011-06-03 425-505 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BELLEVUE WA
2011-02-02 425-623 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2010-11-10 425-404 0–9 XXXall 10 · 5 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 EVERETT WA
2010-09-27 425-247 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 TELECOM OF WASHINGTON, LLC - WA 7455 BELLEVUE WA
2010-09-20 425-633 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2009-09-17 425-312 0–9 XXXall 10 · 6 holders which blocks → ELECTRIC LIGHTWAVE LLC DBA ALLSTREAM 7173 EVERETT WA
2008-09-19 425-622 0–9 XXXall 10 · 3 holders which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 EVERETT WA
2008-08-01 425-298 0–9 XXXall 10 · 5 holders which blocks → PAETEC ITEL, LLC 829J KIRKLAND WA
2008-07-10 425-449 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BELLEVUE WA
2008-02-13 425-440 0–9 XXXall 10 · 6 holders which blocks → QWEST CORPORATION 9638 BELLEVUE WA
2007-11-12 425-516 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BELLEVUE WA
2007-10-08 425-538 0–9 XXXwhole prefix which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KIRKLAND WA
2007-02-02 425-302 0–9 XXXwhole prefix which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 BOTHELL WA
2006-10-31 425-512 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J EVERETT 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.