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 217
T-MOBILE USA, INC. 40
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
2020-12-14 217-969 0XXX1XXX2XXX3XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 LITCHFIELD IL
2018-12-17 217-920 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 DANVILLE IL
2018-10-18 217-926 1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 ARCOLA IL
2017-10-10 217-790 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 CHARLESTON IL
2016-05-05 217-695 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 QUINCY IL
2007-12-01 217-940 none assigned yet which blocks → T-MOBILE USA, INC. 6529 TAYLORVL IL
2004-11-22 217-506 0XXX1XXX2XXX3XXX4XXX5XXX6XXX9XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 QUINCY IL
2004-07-06 217-565 0XXX1XXX2XXX3XXX5XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 TAYLORVL IL
2003-05-30 217-550 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 CHAMPAURBN IL
2003-05-16 217-530 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 CHAMPAURBN IL
2002-07-10 217-775 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 DECATUR IL
2002-04-24 217-841 none assigned yet which blocks → T-MOBILE USA, INC. 6529 CHAMPAURBN IL
2001-09-28 217-819 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 CHAMPAURBN IL
2001-04-04 217-712 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 PARIS IL
2001-04-04 217-816 0XXX which blocks → T-MOBILE USA, INC. 6529 SPRINGFLD IL
— 217-201 none assigned yet which blocks → T-MOBILE USA, INC. 6529 DECATUR IL
— 217-220 2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 SPRINGFLD IL
— 217-240 1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 EFFINGHAM IL
— 217-280 3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 SPRINGFLD IL
— 217-304 none assigned yet which blocks → T-MOBILE USA, INC. 6529 DANVILLE IL
— 217-305 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 CHAMPAURBN IL
— 217-306 9XXX which blocks → T-MOBILE USA, INC. 6529 SPRINGFLD IL
— 217-316 5XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 QUINCY IL
— 217-317 0XXX2XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 MATTOON IL
— 217-390 none assigned yet which blocks → T-MOBILE USA, INC. 6529 CHAMPAURBN IL
— 217-480 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 CHAMPAURBN IL
— 217-481 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 SPRINGFLD IL
— 217-512 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 CHARLESTON IL
— 217-519 8XXX9XXX which blocks → T-MOBILE USA, INC. 6529 DECATUR IL
— 217-520 none assigned yet which blocks → T-MOBILE USA, INC. 6529 DECATUR IL
— 217-553 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SPRINGFLD IL
— 217-570 0XXX1XXX2XXX3XXX5XXX7XXX8XXX9XXX · 8 holders which blocks → T-MOBILE USA, INC. 6529 CLINTON IL
— 217-637 9XXX which blocks → T-MOBILE USA, INC. 6529 CHAMPAURBN IL
— 217-638 none assigned yet which blocks → T-MOBILE USA, INC. 6529 SPRINGFLD IL
— 217-719 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 JACKSONVL IL
— 217-721 2XXX6XXX8XXX which blocks → T-MOBILE USA, INC. 6529 CHAMPAURBN IL
— 217-750 1XXX2XXX3XXX4XXX5XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 LINCOLN IL
— 217-766 0XXX which blocks → T-MOBILE USA, INC. 6529 CHAMPAURBN IL
— 217-848 2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 DECATUR IL
— 217-962 2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 MATTOON IL

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.