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
2023-01-18 531-315 0XXX2XXX6XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - NE 3233 BLAIR NE
2023-01-18 579-392 not yet reported which blocks → Fibernetics Corporation 464D St-Jean —
2023-01-18 586-302 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MT CLEMENS MI
2023-01-18 657-654 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CA 6006 ANAHEIM CA
2023-01-18 683-684 not yet reported which blocks → Fibernetics Corporation 464D Alliston —
2023-01-18 806-386 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 HEREFORD TX
2023-01-18 825-878 not yet reported which blocks → Fibernetics Corporation 464D Edmonton —
2023-01-18 945-286 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 GRANDPRARI TX
2023-01-18 970-851 0–9 XXXall 10 · 6 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 FT COLLINS CO
2023-01-17 252-280 0XXX1XXX2XXX3XXX · 2 holders which blocks → ONVOY, LLC - NC 638E LUCAMA NC
2023-01-17 252-742 0XXX2XXX7XXX · 2 holders which blocks → TWILIO INTERNATIONAL, INC. 506J WEEKSVILLE NC
2023-01-17 474-753 not yet reported which blocks → Fibernetics Corporation 464D Imperial —
2023-01-17 474-754 not yet reported which blocks → Fibernetics Corporation 464D Raymore —
2023-01-17 474-755 not yet reported which blocks → Fibernetics Corporation 464D Riceton —
2023-01-17 474-756 not yet reported which blocks → Fibernetics Corporation 464D Strasbourg —
2023-01-17 807-712 not yet reported which blocks → Bell Mobility 6574 Nipigon —
2023-01-13 239-414 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 FTMYERSBCH FL
2023-01-13 240-982 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - MD 876D GAITHERSBG MD
2023-01-13 252-575 0XXX5XXX7XXX · 2 holders which blocks → ONVOY, LLC - NC 638E SHILOH NC
2023-01-13 253-378 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 AUBURN WA
2023-01-13 256-989 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 SCOTTSBORO AL
2023-01-13 262-315 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 OCONOMOWOC WI
2023-01-13 331-343 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC 224C DOWNERSGRV IL
2023-01-13 340-205 not yet reported which blocks → LIBERTY MOBILE USVI INC. 638J CHTAMSTTHS VI
2023-01-13 340-207 not yet reported which blocks → LIBERTY MOBILE USVI INC. 638J CHTAMSTTHS VI
2023-01-13 340-210 not yet reported which blocks → LIBERTY MOBILE USVI INC. 638J CHTAMSTTHS VI
2023-01-13 464-266 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC 224C CICERO IL
2023-01-13 504-545 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - LA 749E LAFITTE LA
2023-01-13 551-451 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - NJ 637C CLIFFSIDE NJ
2023-01-13 582-231 0XXX1XXX · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H SMETHPORT PA
2023-01-13 603-202 0–9 XXXall 10 · 4 holders which blocks → OMNIPOINT MIAMI E LICENSE, LLC 6889 CONCORD NH
2023-01-13 669-629 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - CA 649C SNJS NORTH CA
2023-01-13 743-334 0XXX1XXX2XXX3XXX4XXX8XXX9XXX · 3 holders which blocks → ONVOY, LLC - NC 638E OLDTOWN NC
2023-01-13 743-344 0XXX1XXX3XXX4XXX8XXX · 4 holders which blocks → ONVOY, LLC - NC 638E WELCOME NC
2023-01-13 747-717 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - CA 649C NO HOLLYWD CA
2023-01-13 747-727 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - CA 649C VAN NUYS CA
2023-01-13 782-644 not yet reported which blocks → Fibernetics Corporation 464D Truro —
2023-01-13 782-645 not yet reported which blocks → Fibernetics Corporation 464D Windsor —
2023-01-13 808-399 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 HONOLULU HI
2023-01-13 828-784 0XXX4XXX8XXX · 2 holders which blocks → ONVOY, LLC - NC 638E LAKE LURE NC
2023-01-13 839-239 0XXX3XXX4XXX6XXX8XXX · 4 holders which blocks → ONVOY, LLC - SC 548E CHPNLTLMTN SC
2023-01-13 840-804 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - CA 649C CLAREMONT CA
2023-01-13 856-618 0–9 XXXwhole prefix which blocks → ONVOY, LLC - NJ 637C BLACKWOOD NJ
2023-01-13 872-372 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC 224C CHICGOZN05 IL
2023-01-13 915-337 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 EL PASO TX
2023-01-13 920-500 0–9 XXXall 10 · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J OSHKOSH WI
2023-01-13 931-373 1XXX3XXX · 2 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K RICKMAN TN
2023-01-13 945-445 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - TX 903C PRINCETON TX
2023-01-13 948-207 0–9 XXXwhole prefix which blocks → ONVOY, LLC - VA 138E NRFOLKZON4 VA
2023-01-13 951-721 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - CA 649C MURRIETA CA

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.