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 317
METROPCS, INC. 14
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
2016-07-18 317-499 0–9 XXXall 10 · 2 holders which blocks → METROPCS, INC. 5562 INDIANAPLS IN
2014-12-12 317-981 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 INDIANAPLS IN
2014-09-25 317-960 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 INDIANAPLS IN
2014-08-20 317-969 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 INDIANAPLS IN
2014-03-17 317-986 0–9 XXXall 10 · 6 holders which blocks → METROPCS, INC. 5562 INDIANAPLS IN
2014-02-18 317-737 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 INDIANAPLS IN
2013-10-25 317-975 0–9 XXXall 10 · 8 holders which blocks → METROPCS, INC. 5562 CARMEL IN
2013-10-25 317-992 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 INDIANAPLS IN
2001-10-08 317-563 0XXX1XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → METROPCS, INC. 5562 DANVILLE IN
2001-08-21 317-401 2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → METROPCS, INC. 5562 SHELBYVL IN
2001-02-15 317-538 none assigned yet which blocks → METROPCS, INC. 5562 INDIANAPLS IN
— 317-281 none assigned yet which blocks → METROPCS, INC. 5562 INDIANAPLS IN
— 317-557 none assigned yet which blocks → METROPCS, INC. 5562 INDIANAPLS IN
— 317-714 none assigned yet which blocks → METROPCS, INC. 5562 INDIANAPLS IN

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.