NumberResearch Membership · Data 09/29/2026

Recent prefix assignments

347 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/29/2026

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 28
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 23
ONVOY, LLC - CA 19
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
2020-08-13 343-559 not yet reported which blocks → ISP Telecom Inc. 4727 Arden —
2020-08-13 343-560 not yet reported which blocks → ISP Telecom Inc. 4727 Bloomfield —
2020-08-13 343-561 not yet reported which blocks → ISP Telecom Inc. 4727 Cardiff —
2020-08-13 343-562 not yet reported which blocks → ISP Telecom Inc. 4727 Picton —
2020-08-13 343-577 not yet reported which blocks → ISP Telecom Inc. 4727 Bath —
2020-08-13 380-217 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 PLAIN CITY OH
2020-08-13 434-240 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 478J CHATHAM VA
2020-08-13 442-329 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 ESCONDIDO CA
2020-08-13 463-240 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 OAKLANDON IN
2020-08-13 470-627 0–9 XXXall 10 · 5 holders which blocks → VONAGE AMERICA LLC 197D NEWNAN GA
2020-08-13 470-628 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - GA 6540 GAINESVL GA
2020-08-13 470-634 0–9 XXXall 10 · 3 holders which blocks → VONAGE AMERICA LLC 197D BOWDON GA
2020-08-13 506-282 not yet reported which blocks → Bell Mobility Aliant 329A Fredericton —
2020-08-13 574-501 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - IN 097D GOSHEN IN
2020-08-13 603-607 1XXX2XXX5XXX6XXX7XXX · 3 holders which blocks → NUSO, LLC 478J WCHESTEFLD NH
2020-08-13 619-706 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA
2020-08-13 629-895 0–9 XXXall 10 · 2 holders which blocks → TWILIO INTERNATIONAL, INC. 506J NASHVILLE TN
2020-08-13 727-340 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - FL 6502 CLEARWATER FL
2020-08-13 762-254 0–9 XXXall 10 · 3 holders which blocks → BANDWIDTH.COM CLEC, LLC - GA 983E ROME GA
2020-08-13 762-257 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 478J AUGUSTA GA
2020-08-13 765-752 0XXX1XXX2XXX7XXX · 3 holders which blocks → ONVOY, LLC - IN 097D MECHANCSBG IN
2020-08-13 808-480 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - HI 210H HILO HI
2020-08-13 828-822 1XXX2XXX3XXX4XXX5XXX · 4 holders which blocks → NUSO, LLC 478J WATERVILLE NC
2020-08-13 850-861 0–9 XXXall 10 · 2 holders which blocks → TWILIO INTERNATIONAL, INC. 506J PENSACOLA FL
2020-08-13 850-917 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - FL 937C VERNON FL
2020-08-13 865-895 0–9 XXXall 10 · 8 holders which blocks → TWILIO INTERNATIONAL, INC. 506J KNOXVILLE TN
2020-08-13 916-829 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 ELK GROVE CA
2020-08-13 949-594 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 LAGUNA BCH CA
2020-08-12 210-873 0–9 XXXall 10 · 2 holders which blocks → METROPCS, INC. 5562 SANANTONIO TX
2020-08-12 210-972 0–9 XXXwhole prefix which blocks → ONVOY, LLC - TX 903C SANANTONIO TX
2020-08-12 240-730 0–9 XXXall 10 · 5 holders which blocks → HD CARRIER LLC 321J HAGERSTOWN MD
2020-08-12 440-672 0–9 XXXall 10 · 3 holders which blocks → HD CARRIER LLC 321J CLEVELAND OH
2020-08-12 463-238 0–9 XXXall 10 · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IN 4803 NOBLESVL IN
2020-08-12 463-239 0–9 XXXall 10 · 4 holders which blocks → HD CARRIER LLC 321J INDIANAPLS IN
2020-08-12 469-885 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 MCKINNEY TX
2020-08-12 470-624 0–9 XXXall 10 · 3 holders which blocks → METROPCS, INC. 5562 ATLANTA NW GA
2020-08-12 667-286 0XXX1XXX2XXX3XXX4XXX7XXX8XXX9XXX · 3 holders which blocks → HD CARRIER LLC 321J SALISBURY MD
2020-08-12 682-332 0–9 XXXall 10 · 6 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 WEATHERFD TX
2020-08-12 737-277 0–9 XXXwhole prefix which blocks → ONVOY, LLC - TX 903C AUSTIN TX
2020-08-12 779-281 0XXX1XXX2XXX3XXX4XXX5XXX7XXX · 3 holders which blocks → ONVOY, LLC 224C TOLUCA IL
2020-08-12 779-991 0XXX1XXX2XXX3XXX4XXX6XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC 224C LELAND IL
2020-08-12 912-460 0–9 XXXall 10 · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - GA 6116 HINESVILLE GA
2020-08-12 918-882 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BROKENARRW OK
2020-08-11 267-910 0–9 XXXall 10 · 3 holders which blocks → OMNIPOINT COMMUNICATIONS ENTERPRISES, LP 6626 PHLDLPHZN3 PA
2020-08-11 309-802 0XXX1XXX8XXX9XXX · 4 holders which blocks → HD CARRIER LLC 321J PEORIA IL
2020-08-11 405-864 0XXX1XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → WICHITA ONLINE, INC. - OK 258F CASHION OK
2020-08-11 431-900 not yet reported which blocks → Westman Media Cooperative Ltd 120F Treherne —
2020-08-11 431-901 not yet reported which blocks → Westman Media Cooperative Ltd 120F Rathwell —
2020-08-11 431-902 not yet reported which blocks → Westman Media Cooperative Ltd 120F Austin —
2020-08-11 458-592 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 4 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K CAVE JCT OR

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/29/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.