NumberResearch Membership · Data 09/22/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/22/2026

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
T-MOBILE USA, INC. 91
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
2001-04-16 425-344 not yet reported which blocks → T-MOBILE USA, INC. 6529 EVERETT WA
2001-04-16 425-737 not yet reported which blocks → T-MOBILE USA, INC. 6529 EVERETT WA
2001-04-16 425-770 not yet reported which blocks → T-MOBILE USA, INC. 6529 BOTHELL WA
— 425-221 none assigned yet which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
— 425-232 not yet reported which blocks → T-MOBILE USA, INC. 6529 EVERETT WA
— 425-244 none assigned yet which blocks → T-MOBILE USA, INC. 6529 EVERETT WA
— 425-246 not yet reported which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
— 425-260 none assigned yet which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
— 425-268 not yet reported which blocks → T-MOBILE USA, INC. 6529 EVERETT WA
— 425-269 none assigned yet which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
— 425-273 2XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 BOTHELL WA
— 425-280 0XXX2XXX which blocks → T-MOBILE USA, INC. 6529 EVERETT WA
— 425-319 4XXX which blocks → T-MOBILE USA, INC. 6529 EVERETT WA
— 425-345 not yet reported which blocks → T-MOBILE USA, INC. 6529 EVERETT WA
— 425-346 not yet reported which blocks → T-MOBILE USA, INC. 6529 EVERETT WA
— 425-350 not yet reported which blocks → T-MOBILE USA, INC. 6529 EVERETT WA
— 425-351 none assigned yet which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
— 425-442 not yet reported which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
— 425-443 4XXX which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
— 425-444 not yet reported which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
— 425-445 4XXX which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
— 425-471 6XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 BOTHELL WA
— 425-508 5XXX which blocks → T-MOBILE USA, INC. 6529 EVERETT WA
— 425-531 3XXX5XXX7XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
— 425-591 0XXX2XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
— 425-625 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
— 425-652 none assigned yet which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
— 425-750 none assigned yet which blocks → T-MOBILE USA, INC. 6529 EVERETT WA
— 425-754 none assigned yet which blocks → T-MOBILE USA, INC. 6529 EVERETT WA
— 425-761 none assigned yet which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
— 425-766 none assigned yet which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
— 425-772 4XXX which blocks → T-MOBILE USA, INC. 6529 HALLS LAKE WA
— 425-773 not yet reported which blocks → T-MOBILE USA, INC. 6529 HALLS LAKE WA
— 425-780 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 BOTHELL WA
— 425-829 not yet reported which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
— 425-830 none assigned yet which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
— 425-864 none assigned yet which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
— 425-876 none assigned yet which blocks → T-MOBILE USA, INC. 6529 EVERETT WA
— 425-891 none assigned yet which blocks → T-MOBILE USA, INC. 6529 BELLEVUE WA
— 425-931 0XXX which blocks → T-MOBILE USA, INC. 6529 EVERETT WA
— 425-971 2XXX which blocks → T-MOBILE USA, INC. 6529 EVERETT WA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/22/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.