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 740
LEVEL 3 COMMUNICATIONS, LLC - OH 63
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
2019-09-25 740-234 0XXX1XXX2XXX3XXX4XXX5XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 HOPEDALE OH
2018-08-06 740-748 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 FREDERCKTN OH
2016-05-03 740-737 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 NELSONVL OH
2013-06-18 740-770 0XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 FRANKFORT OH
2006-05-01 740-200 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 KILBOURNE OH
2006-02-22 740-675 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 AMANDA OH
2004-10-01 740-936 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 SUNBURY OH
2004-06-28 740-469 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CROOKSVL OH
2003-06-03 740-478 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 LAURELVL OH
2002-08-22 740-436 4XXX7XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 RICHWOOD OH
2002-08-16 740-235 0XXX1XXX2XXX3XXX6XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 NEVADA OH
2002-08-16 740-261 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 9 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 NEWCONCORD OH
2002-08-16 740-265 0XXX1XXX2XXX3XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 DEXTERCITY OH
2002-08-16 740-268 0XXX1XXX2XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 RICHWOOD OH
2002-08-16 740-273 0XXX1XXX2XXX3XXX6XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 WILLIAMSPT OH
2002-08-16 740-279 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 LOGAN OH
2002-08-16 740-287 0XXX1XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 ASHLEY OH
2002-08-16 740-365 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CALDWELL OH
2002-08-16 740-421 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CAMBRIDGE OH
2002-08-16 740-429 0XXX1XXX2XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 BEVERLY OH
2002-08-16 740-431 0XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 BOWERSTON OH
2002-08-16 740-433 2XXX3XXX5XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CADIZ OH
2002-08-16 740-445 0XXX1XXX5XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 BARLOW OH
2002-08-16 740-513 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 DELAWARE OH
2002-07-30 740-480 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CENTERBURG OH
2002-07-30 740-481 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 DANVL OH
2002-07-30 740-759 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 UTICAHOMER OH
2002-07-16 740-326 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 MT VERNON OH
2002-07-16 740-331 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 ATHENS OH
2002-07-16 740-370 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 PORTSMOUTH OH
2002-07-16 740-414 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 IRONTON OH
2002-06-26 740-293 1XXX2XXX3XXX4XXX5XXX7XXX8XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 BARLOW OH
2002-06-26 740-305 1XXX2XXX3XXX5XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CALDWELL OH
2002-06-26 740-308 1XXX3XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 DEXTERCITY OH
2002-06-26 740-316 7XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 BOWERSTON OH
2002-06-26 740-320 4XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CADIZ OH
2002-06-26 740-410 1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 BEVERLY OH
2002-06-26 740-413 1XXX2XXX3XXX4XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 ASHLEY OH
2002-06-25 740-933 4XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 BOWERSTON OH
2002-06-12 740-334 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 NEWARK OH
2002-04-23 740-315 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 8 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 BELPRE OH
2002-04-23 740-836 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 SOMERSET OH
2002-04-10 740-443 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 PIKETON OH
2002-04-10 740-444 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 POMEROY OH
2002-03-21 740-314 0XXX1XXX2XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 STEUBENVL OH
2002-03-21 740-617 0XXX1XXX2XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 ZANESVILLE OH
2002-03-06 740-233 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 GAMBIER OH
2002-02-19 740-231 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 DUFFY OH
2001-09-27 740-994 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 LANCASTER OH
2001-06-26 740-571 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 CIRCLEVL 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.