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 681
T-MOBILE USA, INC. 30
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
2025-09-16 681-981 0XXX1XXX2XXX3XXX9XXX which blocks → T-MOBILE USA, INC. 6529 ANSTED WV
2025-07-24 681-590 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX which blocks → T-MOBILE USA, INC. 6529 ANSTED WV
2025-05-21 681-844 4XXX9XXX which blocks → T-MOBILE USA, INC. 6529 RICHWOOD WV
2025-05-01 681-775 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX which blocks → T-MOBILE USA, INC. 6529 ANSTED WV
2024-08-06 681-543 3XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 SUMMERSVL WV
2023-11-14 681-518 9XXX which blocks → T-MOBILE USA, INC. 6529 CHRLSTNZN3 WV
2022-03-09 681-314 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 PRKRSBGZN3 WV
2022-02-22 681-424 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 CHRLSTNZN6 WV
2021-10-18 681-410 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 HNTNGTNZN2 WV
2021-09-09 681-305 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 BECKLEY WV
2021-04-14 681-363 0XXX1XXX2XXX3XXX4XXX6XXX7XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 CHRLSTNZN5 WV
2021-03-23 681-369 0XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 MULLENS WV
2020-06-11 681-268 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 HNTNGTNZN1 WV
2020-06-01 681-296 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 MULLENS WV
2018-11-01 681-250 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 PINEVILLE WV
2018-06-13 681-234 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 CHRLSTNZN6 WV
2018-06-13 681-297 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 PRKRSBGZN3 WV
2018-06-13 681-381 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 CHRLSTNZN3 WV
2018-06-13 681-387 0XXX1XXX3XXX5XXX6XXX7XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 CHRLSTNZN2 WV
2018-06-13 681-432 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 HNTNGTNZN1 WV
2018-06-13 681-505 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 CHRLSTNZN4 WV
2018-06-13 681-588 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 PRKRSBGZN1 WV
2018-06-13 681-689 2XXX3XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 HNTNGTNZN4 WV
2018-05-01 681-385 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 CHRLSTNZN1 WV
2018-02-06 681-621 1XXX8XXX9XXX which blocks → T-MOBILE USA, INC. 6529 BLUEFIELD WV
2011-10-14 681-245 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 CHRLSTNZN1 WV
2011-09-02 681-204 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 HNTNGTNZN1 WV
2011-04-20 681-203 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 HNTNGTNZN1 WV
2011-04-20 681-427 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 CHRLSTNZN1 WV
— 681-755 not yet reported which blocks → T-MOBILE USA, INC. 6529 ANSTED WV

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.