NumberResearch Membership · Data 09/23/2026

Recent prefix assignments

357 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/23/2026

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. 39
NEW CINGULAR WIRELESS PCS, LLC - IL 28
ONVOY, LLC - CA 27
NEW CINGULAR WIRELESS PCS, LLC - DC 27
ONVOY, LLC - NJ 20
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
2004-03-23 919-617 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NC 7835 PRINCETON NC
2004-03-23 928-216 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PARKER AZ
2004-03-23 989-748 3XXX6XXX8XXX · 2 holders which blocks → WINN TELEPHONE COMPANY DBA WINN TELECOM - MI 0127 GAYLORD MI
2004-03-22 334-208 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 ANDALUSIA AL
2004-03-22 334-508 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 LUVERNE AL
2004-03-22 337-393 0–9 XXXall 10 · 8 holders which blocks → AT&T - LOCAL 7421 RAYNE LA
2004-03-22 403-795 not yet reported which blocks → Bell Mobility 6574 Lethbridge —
2004-03-22 514-454 not yet reported which blocks → Groupe Maskatel Quebec LP 8254 Montreal —
2004-03-22 514-455 not yet reported which blocks → Groupe Maskatel Quebec LP 8254 Montreal —
2004-03-22 514-456 not yet reported which blocks → Groupe Maskatel Quebec LP 8254 Montreal —
2004-03-22 567-429 1XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - OH 464C FINDLAY OH
2004-03-22 607-258 1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K APALACHIN NY
2004-03-22 773-310 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 CHICGOZN10 IL
2004-03-19 231-203 2XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ALANSON MI
2004-03-19 256-250 1XXX2XXX3XXX4XXX5XXX8XXX which blocks → PAETEC ITEL, LLC 829J DECATUR AL
2004-03-19 289-623 not yet reported which blocks → Fido Solutions Inc. 5643 Malton —
2004-03-19 289-822 not yet reported which blocks → Fido Solutions Inc. 5643 Port Credit —
2004-03-19 289-882 not yet reported which blocks → Fido Solutions Inc. 5643 South Pickering —
2004-03-19 289-883 not yet reported which blocks → Fido Solutions Inc. 5643 Cooksville —
2004-03-19 289-893 not yet reported which blocks → Fido Solutions Inc. 5643 Whitby —
2004-03-19 289-896 not yet reported which blocks → Fido Solutions Inc. 5643 Streetsville —
2004-03-19 301-660 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 KEEDYSVL MD
2004-03-19 321-293 0–9 XXXwhole prefix which blocks → MCI WORLDCOM COMMUNICATIONS, INC. - FL 7448 ORLANDO FL
2004-03-19 337-222 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → METROPCS, INC. 5562 DE QUINCY LA
2004-03-19 337-300 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → VOICESTREAM GSM I, LLC 150C ELTON LA
2004-03-19 337-320 0XXX which blocks → VOICESTREAM GSM I, LLC 150C OBERLIN LA
2004-03-19 337-338 0XXX8XXX which blocks → METROPCS, INC. 5562 WELSH LA
2004-03-19 337-379 1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → METROPCS, INC. 5562 IOWA LA
2004-03-19 337-387 0XXX1XXX2XXX3XXX4XXX6XXX7XXX · 4 holders which blocks → VOICESTREAM GSM I, LLC 150C WELSH LA
2004-03-19 337-389 1XXX6XXX7XXX9XXX · 3 holders which blocks → VOICESTREAM GSM I, LLC 150C OBERLIN LA
2004-03-19 337-390 0XXX2XXX3XXX4XXX5XXX7XXX9XXX · 5 holders which blocks → VOICESTREAM GSM I, LLC 150C KINDER LA
2004-03-19 337-391 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 6 holders which blocks → VOICESTREAM GSM I, LLC 150C IOWA LA
2004-03-19 443-353 0–9 XXXall 10 · 6 holders which blocks → VERIZON MARYLAND, INC. 9212 COCKEYSVL MD
2004-03-19 502-286 0–9 XXXall 10 · 7 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 NEW HAVEN KY
2004-03-19 580-348 0XXX1XXX2XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BRECKENRDG OK
2004-03-19 660-235 0–9 XXXall 10 · 7 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 STANBERRY MO
2004-03-19 716-227 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 RUSHFORD NY
2004-03-19 859-374 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - KY 6500 JUNCTIONCY KY
2004-03-19 859-376 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - KY 6500 WACO KY
2004-03-19 906-204 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 ISHPEMING MI
2004-03-19 912-245 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - GA 6540 VIDALIA GA
2004-03-19 918-990 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BRAGGS OK
2004-03-18 254-736 1XXX4XXX5XXX6XXX7XXX8XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 JONESBORO TX
2004-03-18 254-998 2XXX3XXX5XXX6XXX7XXX · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MORGAN TX
2004-03-18 289-828 not yet reported which blocks → Fido Solutions Inc. 5643 Burlington —
2004-03-18 289-898 not yet reported which blocks → Fido Solutions Inc. 5643 Clarkson —
2004-03-18 301-750 0–9 XXXall 10 · 5 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 FRIENDSVL MD
2004-03-18 301-799 0–9 XXXall 10 · 3 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 KEEDYSVL MD
2004-03-18 301-882 0–9 XXXall 10 · 4 holders which blocks → CORE COMMUNICATIONS, INC.- MD 2593 NEW MARKET MD
2004-03-18 325-220 1XXX2XXX9XXX which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 SANTA ANNA TX

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/23/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.