NumberResearch Membership · Data 09/27/2026

Recent prefix assignments

341 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/27/2026

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, last 30 days
8X8, INC. 43
NEW CINGULAR WIRELESS PCS, LLC - DC 26
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 22
ONVOY, LLC - CA 21
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
— 330-963 not yet reported which blocks → WINDSTREAM WESTERN RESERVE, INC. 0666 TWINSBURG OH
— 330-965 not yet reported which blocks → OHIO BELL TEL CO 9321 YOUNGSTOWN OH
— 330-966 not yet reported which blocks → OHIO BELL TEL CO 9321 NO CANTON OH
— 330-968 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - OH 4863 KENT OH
— 330-971 not yet reported which blocks → OHIO BELL TEL CO 9321 AKRON OH
— 330-972 not yet reported which blocks → OHIO BELL TEL CO 9321 AKRON OH
— 330-976 not yet reported which blocks → OH
— 330-981 not yet reported which blocks → SPOK, INC. 6630 AKRON OH
— 330-982 not yet reported which blocks → ARMSTRONG TELECOMMUNICATIONS, INC. - OH 024E SMITHVILLE OH
— 330-983 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - OH 7532 AKRON OH
— 330-995 not yet reported which blocks → WINDSTREAM WESTERN RESERVE, INC. 0666 AURORA OH
— 330-996 not yet reported which blocks → OHIO BELL TEL CO 9321 AKRON OH
— 331-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT IL
— 331-241 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC 224C LOMBARD IL
— 331-258 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC 224C AURORA IL
— 331-259 0–9 XXXall 10 · 5 holders which blocks → PEERLESS NETWORK OF ILLINOIS, LLC - IL 063E SUGARGROVE IL
— 331-265 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC 224C GENEVA IL
— 331-301 0–9 XXXall 10 · 6 holders which blocks → METROPCS, INC. 5562 AURORA IL
— 331-303 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E ELBURN IL
— 331-309 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → COMMIO, LLC 939H LEMONT IL
— 331-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT IL
— 331-318 0–9 XXXall 10 · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E LEMONT IL
— 331-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT IL
— 331-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT IL
— 331-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT IL
— 331-591 not yet reported which blocks → IL
— 331-611 not yet reported which blocks → MULTIPLE OCN LISTING MULT IL
— 331-642 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E ELMHURST IL
— 331-700 not yet reported which blocks → IL
— 331-711 not yet reported which blocks → MULTIPLE OCN LISTING MULT IL
— 331-725 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 OSWEGO IL
— 331-811 not yet reported which blocks → MULTIPLE OCN LISTING MULT IL
— 331-825 not yet reported which blocks → DIGITAL NETWORK ACCESS COMMUNICATIONS, INC. - IL 972C GENEVA IL
— 331-911 not yet reported which blocks → MULTIPLE OCN LISTING MULT IL
— 331-950 not yet reported which blocks → IL
— 331-958 not yet reported which blocks → IL
— 331-959 not yet reported which blocks → IL
— 331-976 not yet reported which blocks → IL
— 332-211 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX NY
— 332-222 0–9 XXXwhole prefix which blocks → ONVOY, LLC- NY 384C NWYRCYZN01 NY
— 332-249 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC- NY 384C NWYRCYZN01 NY
— 332-270 0–9 XXXall 10 · 3 holders which blocks → FIVE9, INC. 598J NWYRCYZN01 NY
— 332-300 0–9 XXXwhole prefix which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E NWYRCYZN01 NY
— 332-311 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX NY
— 332-333 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC- NY 384C NWYRCYZN01 NY
— 332-411 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX NY
— 332-444 0–9 XXXwhole prefix which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E NWYRCYZN01 NY
— 332-500 0–9 XXXwhole prefix which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E NWYRCYZN01 NY
— 332-511 not yet reported which blocks → MULTIPLE OCN LISTING MULT XXXXXXXXXX NY
— 332-555 not yet reported which blocks → MULTIPLE OCN LISTING MULT DIR ASST NY

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/27/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.