NumberResearch Membership · Data 09/19/2026

Recent prefix assignments

0 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/19/2026

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 330
T-MOBILE USA, INC. 62
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
2023-08-04 330-200 2XXX8XXX9XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 SHARON OH
2009-10-16 330-999 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 AKRON OH
2009-09-30 330-617 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 CANTON OH
2009-09-30 330-906 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 AKRON OH
2006-03-01 330-942 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 YOUNGSTOWN OH
2002-10-31 330-741 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → T-MOBILE USA, INC. 6529 BRUNSWICK OH
2002-04-24 330-361 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 NO CANTON OH
2002-04-22 330-396 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 MONTROSE OH
2002-04-08 330-934 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 NEWPHLDLPH OH
2002-04-08 330-998 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 TWINSBURG OH
2002-03-20 330-356 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 ALLIANCE OH
2002-03-20 330-389 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 RAVENNA OH
2002-03-20 330-391 2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 MEDINA OH
2002-03-20 330-412 5XXX6XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 CANTON OH
2002-03-20 330-619 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 SHARON OH
2002-03-20 330-766 4XXX5XXX6XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 WARREN OH
2002-03-20 330-881 not yet reported which blocks → T-MOBILE USA, INC. 6529 YOUNGSTOWN OH
2002-03-20 330-990 not yet reported which blocks → T-MOBILE USA, INC. 6529 AKRON OH
2002-02-28 330-313 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 CANTON OH
2002-01-12 330-371 none assigned yet which blocks → T-MOBILE USA, INC. 6529 CANTON OH
2001-11-12 330-431 none assigned yet which blocks → T-MOBILE USA, INC. 6529 AKRON OH
2001-06-23 330-708 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 ELIVERPOOL OH
2001-06-22 330-459 none assigned yet which blocks → T-MOBILE USA, INC. 6529 AKRON OH
2001-03-20 330-541 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 KENT OH
2001-01-10 330-209 0XXX6XXX7XXX8XXX which blocks → T-MOBILE USA, INC. 6529 CANTON OH
2001-01-05 330-883 0XXX2XXX which blocks → T-MOBILE USA, INC. 6529 WARREN OH
— 330-219 none assigned yet which blocks → T-MOBILE USA, INC. 6529 WARREN OH
— 330-233 none assigned yet which blocks → T-MOBILE USA, INC. 6529 YOUNGSTOWN OH
— 330-265 0XXX2XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 CANTON OH
— 330-268 0XXX which blocks → T-MOBILE USA, INC. 6529 CANTON OH
— 330-277 0XXX2XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 SALEM OH
— 330-281 0XXX2XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → T-MOBILE USA, INC. 6529 RAVENNA OH
— 330-304 0XXX1XXX2XXX3XXX4XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 MEDINA OH
— 330-307 0XXX2XXX which blocks → T-MOBILE USA, INC. 6529 WARREN OH
— 330-321 0XXX which blocks → T-MOBILE USA, INC. 6529 MEDINA OH
— 330-327 none assigned yet which blocks → T-MOBILE USA, INC. 6529 CANTON OH
— 330-328 none assigned yet which blocks → T-MOBILE USA, INC. 6529 AKRON OH
— 330-329 none assigned yet which blocks → T-MOBILE USA, INC. 6529 AKRON OH
— 330-330 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 YOUNGSTOWN OH
— 330-338 0XXX which blocks → T-MOBILE USA, INC. 6529 AKRON OH
— 330-347 0XXX2XXX which blocks → T-MOBILE USA, INC. 6529 WOOSTER OH
— 330-348 0XXX5XXX8XXX · 3 holders which blocks → T-MOBILE USA, INC. 6529 AURORA OH
— 330-350 3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 MEDINA OH
— 330-351 none assigned yet which blocks → T-MOBILE USA, INC. 6529 AKRON OH
— 330-352 none assigned yet which blocks → T-MOBILE USA, INC. 6529 AKRON OH
— 330-353 8XXX9XXX which blocks → T-MOBILE USA, INC. 6529 CANTON OH
— 330-354 0XXX2XXX4XXX5XXX7XXX which blocks → T-MOBILE USA, INC. 6529 HARTVILLE OH
— 330-447 0XXX2XXX which blocks → T-MOBILE USA, INC. 6529 NEWPHLDLPH OH
— 330-518 none assigned yet which blocks → T-MOBILE USA, INC. 6529 YOUNGSTOWN OH
— 330-519 0XXX2XXX which blocks → T-MOBILE USA, INC. 6529 YOUNGSTOWN OH

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/19/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.