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
2011-09-08 857-268 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 BOSTON MA
2011-09-08 862-277 0–9 XXXall 10 · 8 holders which blocks → PAETEC ITEL, LLC 829J VERONA NJ
2011-09-08 978-221 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LOWELL MA
2011-09-07 214-814 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F DLFTWTARPT TX
2011-09-07 226-242 not yet reported which blocks → Iristel Inc. 154E Woodstock —
2011-09-07 226-784 not yet reported which blocks → Iristel Inc. 154E Sarnia —
2011-09-07 240-204 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WSHNGTNZN2 MD
2011-09-07 240-444 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 LAUREL236 MD
2011-09-07 302-660 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - DE 7220 WILMINGTON DE
2011-09-07 360-338 0–9 XXXall 10 · 8 holders which blocks → COMCAST IP PHONE, LLC 318J OLYMPIA WA
2011-09-07 443-903 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BEL AIR MD
2011-09-07 443-915 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 BALTIMORE MD
2011-09-07 443-941 0–9 XXXall 10 · 8 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 ELKTON MD
2011-09-07 443-952 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 WESTMINSTR MD
2011-09-07 443-953 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MD 6395 SALISBURY MD
2011-09-07 513-441 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - OH 6025 CINCINNATI OH
2011-09-07 587-352 not yet reported which blocks → Shaw Telecom Inc. 497E Calgary —
2011-09-07 587-520 not yet reported which blocks → Shaw Telecom Inc. 497E Edmonton —
2011-09-07 671-489 not yet reported which blocks → TELEGUAM HOLDINGS, LLC 3922 AGANA GU
2011-09-07 701-380 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - ND 452F MAYVILLE ND
2011-09-07 713-997 0–9 XXXall 10 · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - TX 7138 HOUSTON TX
2011-09-07 740-292 0XXX1XXX2XXX7XXX8XXX9XXX · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F STOCKPORT OH
2011-09-07 819-807 not yet reported which blocks → Iristel Inc. 154E Trois-Rivieres —
2011-09-07 872-225 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC 224C CHICGOZN01 IL
2011-09-07 978-942 0–9 XXXall 10 · 4 holders which blocks → TC SYSTEMS, INC. 7135 LOWELL MA
2011-09-06 204-808 not yet reported which blocks → Iristel Inc. 154E Winnipeg —
2011-09-06 301-557 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MD 6119 WSHNGTNZN3 MD
2011-09-06 306-992 not yet reported which blocks → Iristel Inc. 154E Regina —
2011-09-06 331-213 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 NAPERVILLE IL
2011-09-06 334-583 not yet reported which blocks → PINE BELT CELLULAR, INC. 4260 ALBERTA AL
2011-09-06 334-626 not yet reported which blocks → PINE BELT CELLULAR, INC. 4260 THOMASTON AL
2011-09-06 334-638 not yet reported which blocks → PINE BELT CELLULAR, INC. 4260 THOMASVL AL
2011-09-06 334-668 not yet reported which blocks → PINE BELT CELLULAR, INC. 4260 UNIONTOWN AL
2011-09-06 334-680 not yet reported which blocks → PINE BELT CELLULAR, INC. 4260 MARION AL
2011-09-06 334-882 not yet reported which blocks → PINE BELT CELLULAR, INC. 4260 CAMDEN AL
2011-09-06 334-973 not yet reported which blocks → PINE BELT CELLULAR, INC. 4260 PINE HILL AL
2011-09-06 334-995 not yet reported which blocks → PINE BELT CELLULAR, INC. 4260 ORRVILLE AL
2011-09-06 647-471 not yet reported which blocks → TELUS Mobility 8303 Toronto —
2011-09-06 647-472 not yet reported which blocks → TELUS Mobility 8303 Toronto —
2011-09-06 647-473 not yet reported which blocks → TELUS Mobility 8303 Toronto —
2011-09-06 786-212 0–9 XXXall 10 · 2 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 MIAMI FL
2011-09-02 208-391 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BOISE ID
2011-09-02 254-374 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → AT&T ENTERPRISES, LLC 516C GHOLSON TX
2011-09-02 312-292 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN01 IL
2011-09-02 386-200 0–9 XXXall 10 · 4 holders which blocks → AT&T ENTERPRISES, LLC 516C PIERSON FL
2011-09-02 412-275 0–9 XXXall 10 · 7 holders which blocks → COMCAST IP PHONE, LLC 318J PTGSBNZN14 PA
2011-09-02 567-209 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - OH 001F LEXINGTON OH
2011-09-02 681-204 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → T-MOBILE USA, INC. 6529 HNTNGTNZN1 WV
2011-09-02 806-728 not yet reported which blocks → VEXUS 4913 SLATON TX
2011-09-02 904-203 0–9 XXXall 10 · 6 holders which blocks → AT&T ENTERPRISES, LLC 516C MIDDLEBURG FL

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.