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
2021-07-23 425-946 0XXX1XXX2XXX3XXX5XXX6XXX8XXX · 6 holders which blocks → FRACTEL, LLC 965H CARNATION WA
2021-07-23 425-966 0XXX2XXX3XXX6XXX7XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H SNOQUMPASS WA
2021-06-09 425-537 0–9 XXXall 10 · 5 holders which blocks → TON80 COMMUNICATIONS, LLC 516J BOTHELL WA
2021-04-24 425-534 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 HALLS LAKE WA
2021-04-21 425-400 0–9 XXXall 10 · 2 holders which blocks → FRACTEL, LLC 965H AMES LAKE WA
2021-04-21 425-500 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H BELLEVUE WA
2021-04-21 425-600 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H ISSAQUAH WA
2021-03-16 425-866 0–9 XXXall 10 · 2 holders which blocks → TON80 COMMUNICATIONS, LLC 516J BELLEVUE WA
2021-02-25 425-517 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 RENTON WA
2021-02-02 425-386 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - WA 483E EVERETT WA
2021-02-02 425-504 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - WA 483E BELLEVUE WA
2021-01-15 425-364 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 BOTHELL WA
2020-12-22 425-494 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ISSAQUAH WA
2020-12-21 425-520 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2020-10-22 425-470 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 EVERETT WA
2020-09-29 425-532 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2020-09-08 425-477 0–9 XXXall 10 · 4 holders which blocks → VONAGE AMERICA LLC 197D ISSAQUAH WA
2020-09-02 425-510 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J HALLS LAKE WA
2020-08-27 425-371 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BOTHELL WA
2020-07-14 425-666 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H EVERETT WA
2020-07-14 425-900 0–9 XXXall 10 · 3 holders which blocks → FRACTEL, LLC 965H BELLEVUE WA
2020-03-26 425-331 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 ISSAQUAH WA
2020-01-09 425-465 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ISSAQUAH WA
2019-10-31 425-459 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 BELLEVUE WA
2019-10-29 425-300 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BELLEVUE WA
2019-09-30 425-521 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 EVERETT WA
2019-09-03 425-439 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 BOTHELL WA
2019-06-19 425-403 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KIRKLAND WA
2019-04-25 425-436 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2019-01-31 425-515 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2019-01-09 425-480 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 HALLS LAKE WA
2018-12-13 425-705 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 KIRKLAND WA
2018-12-13 425-722 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 KIRKLAND WA
2018-12-12 425-703 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 KIRKLAND WA
2018-12-12 425-706 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 KIRKLAND WA
2018-12-12 425-707 not yet reported which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 KIRKLAND WA
2018-12-06 425-620 0–9 XXXall 10 · 3 holders which blocks → VONAGE AMERICA LLC 197D BELLEVUE WA
2018-11-13 425-428 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 ISSAQUAH WA
2018-11-07 425-414 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WA 5812 ISSAQUAH WA
2018-11-05 425-535 0–9 XXXall 10 · 4 holders which blocks → HD CARRIER LLC 321J EVERETT WA
2018-08-22 425-410 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - WA 6121 BELLEVUE WA
2018-08-15 425-389 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2018-08-10 425-655 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 KIRKLAND WA
2018-04-10 425-624 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
2017-12-07 425-490 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → COMCAST IP PHONE, LLC 318J FALL CITY WA
2017-09-14 425-447 0–9 XXXwhole prefix which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KIRKLAND WA
2017-09-14 425-544 0–9 XXXwhole prefix which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KIRKLAND WA
2017-02-22 425-800 0–9 XXXall 10 · 5 holders which blocks → TELNYX LLC 073H BELLEVUE WA
2016-11-30 425-382 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 EVERETT WA
2016-11-14 425-589 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE 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.