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 573
T-MOBILE USA, INC. 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
2022-12-15 573-902 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 PERRYVILLE MO
2022-04-29 573-816 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 SIKESTON MO
2022-01-13 573-926 0XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 LOUISIANA MO
2021-11-05 573-780 0XXX1XXX2XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 STEGNVIEVE MO
2021-09-08 573-805 0XXX1XXX2XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 NEW MADRID MO
2021-09-08 573-935 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 DEXTER MO
2021-08-27 573-601 0XXX1XXX2XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 KENNETT MO
2021-02-05 573-952 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 FLAT RIVER MO
2020-11-24 573-613 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 FULTON MO
2020-11-12 573-617 0XXX4XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 SULLIVAN MO
2020-11-12 573-661 0XXX1XXX2XXX4XXX6XXX7XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 BOWLNGGREN MO
2019-03-04 573-843 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 CARUTHRSVL MO
2018-10-31 573-507 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 COLUMBIA MO
2015-04-13 573-577 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 HANNIBAL MO
2013-11-15 573-742 0XXX1XXX2XXX3XXX4XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 BOWLNGGREN MO
2006-04-05 573-705 0–9 XXXall 10 · 8 holders which blocks → T-MOBILE USA, INC. 6529 FARMINGTON MO
2003-01-02 573-202 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 ROLLA MO
2002-09-30 573-200 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 CAPEGIRARD MO
2002-01-07 573-586 0XXX3XXX4XXX6XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 FTLENARDWD MO
2001-10-29 573-746 2XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 LKOZKOSBCH MO
— 573-216 none assigned yet which blocks → T-MOBILE USA, INC. 6529 LKOZKOSBCH MO
— 573-219 3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 COLUMBIA MO
— 573-230 0XXX which blocks → T-MOBILE USA, INC. 6529 JEFFERSNCY MO
— 573-268 none assigned yet which blocks → T-MOBILE USA, INC. 6529 COLUMBIA MO
— 573-353 none assigned yet which blocks → T-MOBILE USA, INC. 6529 JEFFERSNCY MO
— 573-356 0XXX1XXX2XXX which blocks → T-MOBILE USA, INC. 6529 COLUMBIA MO
— 573-424 none assigned yet which blocks → T-MOBILE USA, INC. 6529 COLUMBIA MO
— 573-434 3XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 LKOZKOSBCH MO
— 573-462 1XXX2XXX3XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 JEFFERSNCY MO
— 573-467 4XXX which blocks → T-MOBILE USA, INC. 6529 ROLLA MO
— 573-482 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 FARMINGTON MO
— 573-512 2XXX3XXX5XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 FTLENARDWD MO
— 573-514 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 COLUMBIA MO
— 573-529 2XXX4XXX5XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 COLUMBIA MO
— 573-537 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ROLLA MO
— 573-587 5XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 CAPEGIRARD MO
— 573-639 2XXX3XXX4XXX5XXX6XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 COLUMBIA MO
— 573-647 2XXX3XXX4XXX7XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 ROLLA MO
— 573-673 none assigned yet which blocks → T-MOBILE USA, INC. 6529 COLUMBIA MO
— 573-795 8XXX which blocks → T-MOBILE USA, INC. 6529 HANNIBAL MO
— 573-797 3XXX4XXX5XXX8XXX which blocks → T-MOBILE USA, INC. 6529 JEFFERSNCY MO
— 573-832 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 VERSAILLES MO
— 573-872 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 POPLAR BLF MO
— 573-931 2XXX6XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 SIKESTON MO

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.