NumberResearch Membership · Data 09/25/2026

Recent prefix assignments

358 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/25/2026

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 31
ONVOY, LLC - CA 27
NEW CINGULAR WIRELESS PCS, LLC - IL 27
ONVOY, LLC - NJ 15
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
2021-12-10 302-590 0XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J DOVER DE
2021-12-10 307-458 0–9 XXXall 10 · 4 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J CASPER WY
2021-12-10 318-786 0XXX1XXX2XXX8XXX9XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - LA 153F BUNKIE LA
2021-12-10 318-802 0XXX3XXX9XXX · 2 holders which blocks → ELISKA WIRELESS VENTURES SUBSIDIARY I, LLC 6916 TALLULAH LA
2021-12-10 326-204 0–9 XXXall 10 · 5 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J DAYTON OH
2021-12-10 331-282 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC 224C HINSDALE IL
2021-12-10 332-238 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NWYRCYZN01 NY
2021-12-10 385-622 0–9 XXXall 10 · 7 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J SALT LAKE UT
2021-12-10 413-463 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 SPRINGFLD MA
2021-12-10 413-466 0–9 XXXall 10 · 5 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J HOLYOKE MA
2021-12-10 424-475 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 TORRANCE CA
2021-12-10 431-455 not yet reported which blocks → Fibernetics Corporation 464D Pilot Mound —
2021-12-10 431-456 not yet reported which blocks → Fibernetics Corporation 464D Sanford —
2021-12-10 431-457 not yet reported which blocks → Fibernetics Corporation 464D Southport —
2021-12-10 438-372 not yet reported which blocks → Videotron Ltd. 328F Montreal —
2021-12-10 438-541 not yet reported which blocks → Videotron Ltd. 328F Montreal —
2021-12-10 447-220 9XXX which blocks → BOOST SUBSCRIBERCO L.L.C. 490J CHAMPAURBN IL
2021-12-10 448-202 0–9 XXXall 10 · 5 holders which blocks → TELNYX LLC 073H FTWALTNBCH FL
2021-12-10 448-203 0–9 XXXall 10 · 5 holders which blocks → TELNYX LLC 073H MADISON FL
2021-12-10 505-519 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 GALLUP NM
2021-12-10 531-278 0–9 XXXall 10 · 2 holders which blocks → TELNYX LLC 073H LINCOLN NE
2021-12-10 580-680 0XXX6XXX · 2 holders which blocks → ONVOY, LLC - OK 409F ELMOREWEST OK
2021-12-10 607-413 9XXX which blocks → BOOST SUBSCRIBERCO L.L.C. 490J BINGHAMTON NY
2021-12-10 619-974 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 CHULAVISTA CA
2021-12-10 626-630 0–9 XXXall 10 · 4 holders which blocks → T-MOBILE USA, INC. 6529 PSDN PSDN CA
2021-12-10 657-537 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 SILVERADO CA
2021-12-10 660-360 0XXX3XXX6XXX · 2 holders which blocks → ONVOY, LLC - MO 093F SO SEYMOUR MO
2021-12-10 660-688 0XXX1XXX6XXX8XXX · 3 holders which blocks → ONVOY, LLC - MO 093F ATHENS MO
2021-12-10 661-569 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 BKFD MAIN CA
2021-12-10 667-384 0XXX1XXX8XXX · 2 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J SALISBURY MD
2021-12-10 667-385 0XXX1XXX2XXX3XXX4XXX5XXX8XXX · 2 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J SOLOMONS MD
2021-12-10 680-230 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 6 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J UTICA NY
2021-12-10 716-582 0XXX5XXX6XXX · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - NY 997E BOSTON NY
2021-12-10 747-320 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 CANOGAPARK CA
2021-12-10 816-493 0–9 XXXall 10 · 2 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 CAMERON MO
2021-12-10 816-538 0–9 XXXall 10 · 5 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 ST JOSEPH MO
2021-12-10 839-208 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 BARNWELL SC
2021-12-10 848-323 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 EATONTOWN NJ
2021-12-10 878-300 0XXX1XXX3XXX4XXX6XXX7XXX8XXX9XXX · 3 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J NEW CASTLE PA
2021-12-10 917-813 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 NWYRCYZN04 NY
2021-12-10 920-812 0–9 XXXall 10 · 3 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J FONDDU LAC WI
2021-12-10 929-612 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC- NY 384C NWYRCYZN06 NY
2021-12-10 930-253 0XXX2XXX5XXX6XXX9XXX · 3 holders which blocks → OMNIPOINT COMMUNICATIONS MIDWEST OPERATIONS, LLC 2964 FLAT ROCK IN
2021-12-10 937-819 0–9 XXXall 10 · 3 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 MARYSVILLE OH
2021-12-10 939-343 0–9 XXXwhole prefix which blocks → SUNCOM DBA T-MOBILE USA 8645 NARANJITO PR
2021-12-10 939-608 0–9 XXXwhole prefix which blocks → SUNCOM DBA T-MOBILE USA 8645 SAN GERMAN PR
2021-12-10 951-605 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 WOODCREST CA
2021-12-10 980-398 0–9 XXXall 10 · 5 holders which blocks → SUNCOM DBA T-MOBILE USA 8645 MONROE NC
2021-12-09 279-277 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → FRACTEL, LLC 965H RSVL CTHT CA
2021-12-09 431-452 not yet reported which blocks → Fibernetics Corporation 464D Dugald —

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/25/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.