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
2011-09-23 587-990 not yet reported which blocks → TELUS Mobility 8301 Edmonton —
2011-09-23 587-991 not yet reported which blocks → TELUS Mobility 8301 Edmonton —
2011-09-23 613-209 not yet reported which blocks → Iristel Inc. 154E Cornwall —
2011-09-23 651-240 0–9 XXXall 10 · 3 holders which blocks → MIDCONTINENT COMMUNICATIONS - MN 429A TAYLORSFLS MN
2011-09-23 713-904 0–9 XXXall 10 · 5 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7138 HOUSTON TX
2011-09-23 720-469 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 DENVER CO
2011-09-23 806-307 0–9 XXXall 10 · 6 holders which blocks → AT&T ENTERPRISES, LLC 516C SKELLYTOWN TX
2011-09-23 813-302 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - FL 982E TAMPACEN FL
2011-09-23 832-312 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOUSTON TX
2011-09-23 832-540 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOUSTON TX
2011-09-23 914-296 0–9 XXXall 10 · 7 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E POUNDRIDGE NY
2011-09-23 956-396 0–9 XXXall 10 · 5 holders which blocks → AT&T ENTERPRISES, LLC 516C FALCON HTS TX
2011-09-22 226-400 not yet reported which blocks → Iristel Inc. 154E Brantford —
2011-09-22 289-815 not yet reported which blocks → Iristel Inc. 154E Oakville —
2011-09-22 302-268 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WILMINGTON DE
2011-09-22 347-955 0–9 XXXall 10 · 5 holders which blocks → CSC VOICE, LLC 612K NWYRCYZN06 NY
2011-09-22 501-248 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 LITTLEROCK AR
2011-09-22 609-478 0–9 XXXall 10 · 7 holders which blocks → METROPCS, INC. 5562 SEAIS CITY NJ
2011-09-22 610-816 0–9 XXXall 10 · 6 holders which blocks → WINDSTREAM D & E SYSTEMS, INC. - PA 4114 READING PA
2011-09-22 646-564 0–9 XXXall 10 · 4 holders which blocks → PEERLESS NETWORK OF NEW YORK, LLC - NY 155E NWYRCYZN01 NY
2011-09-22 716-256 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 BUFFALO NY
2011-09-22 716-264 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 TONAWANDA NY
2011-09-22 717-736 0–9 XXXall 10 · 5 holders which blocks → WINDSTREAM D & E SYSTEMS, INC. - PA 4114 HARISBGZN1 PA
2011-09-22 774-228 0–9 XXXall 10 · 7 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 OSTERVILLE MA
2011-09-22 774-303 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 WORCESTER MA
2011-09-22 778-270 not yet reported which blocks → Bell West Inc. 2933 Nelson —
2011-09-22 778-271 not yet reported which blocks → Bell West Inc. 2933 Terrace —
2011-09-22 940-222 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DENTON TX
2011-09-21 218-350 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MN 5816 TWINVALLEY MN
2011-09-21 224-229 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DESPLAINES IL
2011-09-21 331-228 0–9 XXXall 10 · 4 holders which blocks → PAETEC ITEL, LLC 829J ST CHARLES IL
2011-09-21 469-203 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 GRANDPRARI TX
2011-09-21 469-206 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 DALLAS TX
2011-09-21 469-208 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 CARROLLTON TX
2011-09-21 469-209 0–9 XXXall 10 · 5 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - TX 6114 PLANO TX
2011-09-21 559-856 0XXX1XXX2XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SELMA CA
2011-09-21 779-225 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 JOLIET IL
2011-09-21 909-334 0–9 XXXall 10 · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CA 8826 CHINO CA
2011-09-20 226-786 not yet reported which blocks → Iristel Inc. 154E Stratford —
2011-09-20 226-798 not yet reported which blocks → Iristel Inc. 154E Chatham —
2011-09-20 305-501 0–9 XXXall 10 · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - FL 4802 KEYS FL
2011-09-20 385-399 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - UT 117F BOUNTIFUL UT
2011-09-20 438-807 not yet reported which blocks → Iristel Inc. 154E Montreal —
2011-09-20 480-845 0–9 XXXall 10 · 5 holders which blocks → MCC TELEPHONY LLC 593K PHOENIX AZ
2011-09-20 513-302 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 CINCINNATI OH
2011-09-20 513-501 0–9 XXXwhole prefix which blocks → T-MOBILE USA, INC. 6529 CINCINNATI OH
2011-09-20 613-902 not yet reported which blocks → Iristel Inc. 154E Belleville —
2011-09-20 646-738 0–9 XXXall 10 · 2 holders which blocks → PAETEC ITEL, LLC 829J NWYRCYZN01 NY
2011-09-20 705-910 not yet reported which blocks → Iristel Inc. 154E Sault Ste. Marie —
2011-09-20 720-625 0–9 XXXall 10 · 5 holders which blocks → PAETEC ITEL, LLC 829J DENVER CO

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.