NumberResearch Membership · Data 09/20/2026

Recent prefix assignments

338 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/20/2026

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
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Recent NPA-NXX prefix assignments
AssignedNPA-NXXThousands-blocks taken (last-4 opening)Code holderOCNRate centerState
2023-04-05 667-430 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 PIKESVILLE MD
2023-04-05 708-500 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 CICERO IL
2023-04-05 727-618 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - FL 937C STPETERSBG FL
2023-04-05 754-314 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - FL 937C HOLLYWOOD FL
2023-04-05 762-850 0–9 XXXall 10 · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H COLUMBUS GA
2023-04-05 838-268 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 COLONIE NY
2023-04-05 838-269 0–9 XXXall 10 · 2 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J SCHENCTADY NY
2023-04-05 912-608 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 DOUGLAS GA
2023-04-05 913-425 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - KS 6532 TONGANOXIE KS
2023-04-05 929-674 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NY 6959 NWYRCYZN10 NY
2023-04-05 939-360 3XXX9XXX · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H PUEBLOVIEJ PR
2023-04-05 939-361 0XXX1XXX2XXX3XXX9XXX · 2 holders which blocks → SUNCOM DBA T-MOBILE USA 8645 MAYAGUEZ PR
2023-04-05 939-787 0XXX1XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H BAYAMONSUR PR
2023-04-04 307-990 0XXX1XXX2XXX3XXX4XXX5XXX8XXX9XXX · 2 holders which blocks → COMMIO, LLC 939H LANDER WY
2023-04-04 308-257 0–9 XXXall 10 · 7 holders which blocks → COMCAST IP PHONE, LLC 318J NO PLATTE NE
2023-04-04 319-401 6XXX which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - IA 8344 TRIPOLI IA
2023-04-04 319-910 0XXX1XXX2XXX4XXX5XXX · 5 holders which blocks → COMMIO, LLC 939H PARKERSBG IA
2023-04-04 458-288 0XXX8XXX · 2 holders which blocks → BANDWIDTH.COM CLEC, LLC - OR 076F GLIDE OR
2023-04-04 474-417 not yet reported which blocks → Fibernetics Corporation 464D Earl Grey —
2023-04-04 474-418 not yet reported which blocks → Fibernetics Corporation 464D Francis —
2023-04-04 474-419 not yet reported which blocks → Fibernetics Corporation 464D Holdfast —
2023-04-04 474-420 not yet reported which blocks → Fibernetics Corporation 464D Lemberg —
2023-04-04 474-421 not yet reported which blocks → Fibernetics Corporation 464D Qu'Appelle —
2023-04-04 502-687 0XXX8XXX9XXX · 3 holders which blocks → AT&T - LOCAL 7421 BAGDAD KY
2023-04-04 725-297 0XXX1XXX2XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - NV 587C SEARCHLIHT NV
2023-04-04 731-216 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 PARIS TN
2023-04-03 218-860 0XXX which blocks → COMMIO, LLC 939H DULUTH MN
2023-04-03 234-434 0–9 XXXall 10 · 4 holders which blocks → COMMIO, LLC 939H YOUNGSTOWN OH
2023-04-03 320-867 5XXX8XXX · 2 holders which blocks → COMMIO, LLC 939H ST CLOUD MN
2023-04-03 385-521 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SPANIHFORK UT
2023-04-03 401-990 0–9 XXXall 10 · 2 holders which blocks → COMMIO, LLC 939H W WARWICK RI
2023-04-03 463-363 0–9 XXXwhole prefix which blocks → ONVOY, LLC - IN 097D ZIONSVILLE IN
2023-04-03 474-412 not yet reported which blocks → Fibernetics Corporation 464D Avonlea —
2023-04-03 474-413 not yet reported which blocks → Fibernetics Corporation 464D Bethune —
2023-04-03 474-414 not yet reported which blocks → Fibernetics Corporation 464D Broadview —
2023-04-03 474-415 not yet reported which blocks → Fibernetics Corporation 464D Craik —
2023-04-03 474-416 not yet reported which blocks → Fibernetics Corporation 464D Cupar —
2023-04-03 480-952 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AZ 6572 PHOENIX AZ
2023-04-03 509-825 1XXX2XXX3XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J MEDICAL LK WA
2023-04-03 573-906 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 CAPEGIRARD MO
2023-04-03 605-820 0XXX which blocks → COMMIO, LLC 939H HURON SD
2023-04-03 609-595 4XXX5XXX7XXX · 3 holders which blocks → COMMIO, LLC 939H DENNISVL NJ
2023-04-03 689-302 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 732J KISSIMMEE FL
2023-04-03 689-304 0–9 XXXall 10 · 2 holders which blocks → NUSO, LLC 732J ORLANDO FL
2023-04-03 719-770 0XXX1XXX7XXX9XXX · 3 holders which blocks → COMMIO, LLC 939H LAMAR CO
2023-04-03 737-360 6XXX9XXX · 2 holders which blocks → BOOST SUBSCRIBERCO L.L.C. 490J JARRELL TX
2023-04-03 743-259 0XXX1XXX2XXX3XXX7XXX8XXX9XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - NC 998E MOCKSVILLE NC
2023-04-03 943-219 0–9 XXXall 10 · 5 holders which blocks → ONVOY SPECTRUM, LLC 624H ATLANTA SO GA
2023-04-03 943-220 1XXX9XXX · 2 holders which blocks → ONVOY SPECTRUM, LLC 624H BREMEN GA
2023-04-03 943-221 0–9 XXXall 10 · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H CUMMING GA

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/20/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.