NumberResearch Membership · Data 09/21/2026

Recent prefix assignments

338 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/21/2026

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. 38
NEW CINGULAR WIRELESS PCS, LLC - IL 28
ONVOY, LLC - CA 26
NEW CINGULAR WIRELESS PCS, LLC - DC 26
ONVOY, LLC - NJ 18
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
Download CSV ↓
Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2011-02-23 581-356 not yet reported which blocks → TELUS Quebec 8083 Newport —
2011-02-23 581-357 not yet reported which blocks → TELUS Quebec 8083 New Carlisle —
2011-02-23 581-358 not yet reported which blocks → TELUS Quebec 8083 Maria —
2011-02-23 651-375 0–9 XXXwhole prefix which blocks → QWEST CORPORATION 9631 TWINCITIES MN
2011-02-23 720-446 0–9 XXXall 10 · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 DENVER CO
2011-02-23 757-985 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NRFOLKZON2 VA
2011-02-23 803-220 0–9 XXXall 10 · 3 holders which blocks → POWERTEL ATLANTA LICENSES, INC. 7473 AIKEN SC
2011-02-23 804-588 0–9 XXXall 10 · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - VA 7238 RICHMOND VA
2011-02-23 862-899 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 PASSAIC NJ
2011-02-23 956-267 0–9 XXXall 10 · 6 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LAREDO TX
2011-02-22 239-400 0–9 XXXall 10 · 2 holders which blocks → YMAX COMMUNICATIONS CORP. - FL 594D FORT MYERS FL
2011-02-22 254-400 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - TX 903C WACO TX
2011-02-22 310-935 0–9 XXXall 10 · 7 holders which blocks → ONVOY, LLC - CA 649C SAN PEDRO CA
2011-02-22 336-738 0–9 XXXall 10 · 8 holders which blocks → AT&T ENTERPRISES, LLC 516C ANDERSON NC
2011-02-22 407-255 0–9 XXXall 10 · 3 holders which blocks → METROPCS NETWORKS, LLC 899D ORLANDO FL
2011-02-22 409-600 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - TX 903C BEAUMONT TX
2011-02-22 561-328 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - FL 982E WPALMBEACH FL
2011-02-22 631-405 0–9 XXXall 10 · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - NY 7133 RIVERHEAD NY
2011-02-22 706-223 0–9 XXXall 10 · 5 holders which blocks → PAETEC ITEL, LLC 829J COLUMBUS GA
2011-02-22 801-900 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 PROVO UT
2011-02-22 812-964 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - IN 097D BLOOMINGTN IN
2011-02-22 828-436 0–9 XXXall 10 · 4 holders which blocks → AT&T ENTERPRISES, LLC 516C LAKE LURE NC
2011-02-22 857-261 0–9 XXXwhole prefix which blocks → METROPCS, INC. 5562 BOSTON MA
2011-02-22 864-300 0–9 XXXall 10 · 5 holders which blocks → SUNCOM DBA T-MOBILE USA 8645 GAFFNEY SC
2011-02-22 903-500 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX which blocks → ONVOY, LLC - TX 903C LONGVIEW TX
2011-02-22 910-418 0XXX1XXX2XXX4XXX7XXX8XXX9XXX · 5 holders which blocks → AT&T ENTERPRISES, LLC 516C GIBSON NC
2011-02-22 915-600 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - TX 903C EL PASO TX
2011-02-22 919-893 0–9 XXXall 10 · 5 holders which blocks → AT&T ENTERPRISES, LLC 516C MOUNTOLIVE NC
2011-02-22 951-322 0–9 XXXall 10 · 4 holders which blocks → MCC TELEPHONY OF THE WEST, LLC - CA 857F PERRIS CA
2011-02-22 956-261 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 WESLACO TX
2011-02-22 956-295 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BROWNSVL TX
2011-02-22 979-383 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - TX 903C BRYAN TX
2011-02-22 980-218 0–9 XXXall 10 · 4 holders which blocks → BELLSOUTH TELECOMM INC DBA SOUTHERN BELL TEL & TEL 9417 CHARLOTTE NC
2011-02-22 980-313 0–9 XXXall 10 · 6 holders which blocks → SUNCOM DBA T-MOBILE USA 8645 MONROE NC
2011-02-21 319-488 4XXX6XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IA 6570 KEYSTONE IA
2011-02-21 478-324 0–9 XXXall 10 · 4 holders which blocks → AT&T ENTERPRISES, LLC 516C COCHRAN GA
2011-02-21 480-525 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - AZ 630E PHOENIX AZ
2011-02-21 484-616 0–9 XXXall 10 · 8 holders which blocks → PAETEC ITEL, LLC 829J ROBESONIA PA
2011-02-21 585-332 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E LYNDONVL NY
2011-02-21 605-755 0–9 XXXwhole prefix which blocks → CLARITY TELECOM, LLC DBA BLUEPEAK 4256 RAPID CITY SD
2011-02-21 701-922 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - ND 999E GRAFTON ND
2011-02-21 707-273 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 EUREKA CA
2011-02-21 732-430 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 FARMINGDL NJ
2011-02-21 734-636 0–9 XXXall 10 · 5 holders which blocks → METROPCS, INC. 5562 MONROE MI
2011-02-21 920-352 0–9 XXXall 10 · 6 holders which blocks → AT&T ENTERPRISES, LLC 516C VAN DYNE WI
2011-02-19 218-576 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 551G DULUTH MN
2011-02-18 289-788 not yet reported which blocks → Videotron Ltd. 383F Hamilton —
2011-02-18 306-217 not yet reported which blocks → SaskTel Mobility 9868 Saltcoats —
2011-02-18 306-399 not yet reported which blocks → SaskTel Mobility 9868 Churchbridge —
2011-02-18 347-868 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NY 4006 NWYRCYZN03 NY

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/21/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.