NumberResearch Membership · Data 09/27/2026

Recent prefix assignments

334 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/27/2026

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 26
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 22
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
2020-10-07 520-496 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 TUCSON AZ
2020-10-07 520-497 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - AZ 587F TUCSON AZ
2020-10-07 561-545 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - FL 6502 WPALMBEACH FL
2020-10-07 561-546 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - FL 6502 BOCA RATON FL
2020-10-07 574-365 0XXX3XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → ONVOY, LLC - IN 097D FULTON IN
2020-10-07 765-758 1XXX4XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → FRACTEL, LLC 965H BUCK CREEK IN
2020-10-07 765-786 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H ELWOOD IN
2020-10-07 765-799 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → FRACTEL, LLC 965H GASTON IN
2020-10-07 765-844 2XXX3XXX4XXX6XXX8XXX · 4 holders which blocks → FRACTEL, LLC 965H FRANKTON IN
2020-10-07 774-438 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MA 6387 NEWBEDFORD MA
2020-10-07 930-218 0XXX1XXX2XXX7XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - IN 097D SHELBURN IN
2020-10-07 930-946 0XXX2XXX3XXX4XXX · 4 holders which blocks → FRACTEL, LLC 965H DUGGER IN
2020-10-07 938-348 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX · 2 holders which blocks → FRACTEL, LLC 965H SKYLINE AL
2020-10-06 216-353 0–9 XXXall 10 · 4 holders which blocks → IP HORIZON LLC 515J CLEVELAND OH
2020-10-06 234-287 0–9 XXXall 10 · 5 holders which blocks → IP HORIZON LLC 515J YOUNGSTOWN OH
2020-10-06 234-288 0–9 XXXall 10 · 5 holders which blocks → IP HORIZON LLC 515J AKRON OH
2020-10-06 249-668 not yet reported which blocks → Fibernetics Corporation 464D Borden-Angus —
2020-10-06 249-669 not yet reported which blocks → Fibernetics Corporation 464D Brechin —
2020-10-06 249-671 not yet reported which blocks → Fibernetics Corporation 464D Creemore —
2020-10-06 249-673 not yet reported which blocks → Fibernetics Corporation 464D Lafontaine —
2020-10-06 249-674 not yet reported which blocks → Fibernetics Corporation 464D Moonstone —
2020-10-06 249-675 not yet reported which blocks → Fibernetics Corporation 464D Port McNicoll —
2020-10-06 249-676 not yet reported which blocks → Fibernetics Corporation 464D Sebright —
2020-10-06 249-677 not yet reported which blocks → Fibernetics Corporation 464D Waubaushene —
2020-10-06 365-369 not yet reported which blocks → Fibernetics Corporation 464D Beeton —
2020-10-06 380-219 0–9 XXXall 10 · 5 holders which blocks → IP HORIZON LLC 515J COLUMBUS OH
2020-10-06 520-492 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J TUCSON AZ
2020-10-06 567-329 0–9 XXXall 10 · 2 holders which blocks → IP HORIZON LLC 515J TOLEDO OH
2020-10-06 609-612 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 478J ATLNTIC CY NJ
2020-10-06 708-736 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E BLUEISLAND IL
2020-10-05 223-244 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - PA 547E LANCASTER PA
2020-10-05 249-667 not yet reported which blocks → Fibernetics Corporation 464D Bluewater —
2020-10-05 249-670 not yet reported which blocks → Fibernetics Corporation 464D Christian Island —
2020-10-05 249-672 not yet reported which blocks → Fibernetics Corporation 464D Elmvale —
2020-10-05 272-273 0XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - PA 547E LAKEWINOLA PA
2020-10-05 279-895 0–9 XXXall 10 · 5 holders which blocks → TWILIO INTERNATIONAL, INC. 506J SCRM MAIN CA
2020-10-05 346-439 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J HSTNSUBURB TX
2020-10-05 346-440 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J HSTNSUBURB TX
2020-10-05 346-441 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J HOUSTON TX
2020-10-05 385-361 0–9 XXXall 10 · 4 holders which blocks → COMCAST IP PHONE, LLC 318J MIDVALE UT
2020-10-05 385-993 0–9 XXXall 10 · 6 holders which blocks → COMCAST IP PHONE, LLC 318J LEHI UT
2020-10-05 470-668 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - GA 983E ATLANTA GA
2020-10-05 470-726 0–9 XXXall 10 · 2 holders which blocks → COMCAST IP PHONE, LLC 318J ATLANTA SO GA
2020-10-05 501-445 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HOTSPRINGS AR
2020-10-05 505-441 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 478J ALBUQURQUE NM
2020-10-05 509-606 0–9 XXXall 10 · 2 holders which blocks → HD CARRIER LLC 321J SPOKANE WA
2020-10-05 661-509 0–9 XXXall 10 · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E BKFD SOUTH CA
2020-10-05 720-912 0–9 XXXwhole prefix which blocks → ONVOY, LLC - CO 026D DENVER CO
2020-10-05 747-297 0–9 XXXall 10 · 5 holders which blocks → BANDWIDTH.COM CLEC, LLC - CA 981E GLENDALE CA
2020-10-05 757-993 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - VA 6827 TEMPERNCVL VA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/27/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.