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
2023-03-16 423-835 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 BRISTOL TN
2023-03-16 434-320 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 732J CHARLOTSVL VA
2023-03-16 434-343 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 DANVILLE VA
2023-03-16 445-281 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 MORRISVL PA
2023-03-16 448-223 0XXX1XXX2XXX3XXX9XXX · 3 holders which blocks → NUSO, LLC 732J CRAWFORDVL FL
2023-03-16 464-212 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 FOREST IL
2023-03-16 517-551 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → METROPCS, INC. 5562 FOWLERVL MI
2023-03-16 548-508 not yet reported which blocks → IXICA Communications Inc. 812H London —
2023-03-16 573-904 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 BIRCH TREE MO
2023-03-16 582-235 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 BOALSBURG PA
2023-03-16 582-236 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 REYNOLDSVL PA
2023-03-16 656-216 0–9 XXXall 10 · 4 holders which blocks → FIVE9, INC. 598J TAMPACEN FL
2023-03-16 689-307 0–9 XXXall 10 · 2 holders which blocks → FIVE9, INC. 598J ORLANDO FL
2023-03-16 689-310 0–9 XXXall 10 · 4 holders which blocks → AT&T - LOCAL 7421 ORLANDO FL
2023-03-16 727-621 0–9 XXXall 10 · 2 holders which blocks → NUSO, LLC 732J CLEARWATER FL
2023-03-16 769-298 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MS 6396 MERIDIAN MS
2023-03-16 779-369 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 MOMENCE IL
2023-03-16 816-614 0–9 XXXall 10 · 2 holders which blocks → NUSO, LLC 732J KANSASCITY MO
2023-03-16 826-216 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 732J BROADWAY VA
2023-03-16 826-218 0XXX6XXX · 2 holders which blocks → COMCAST IP PHONE, LLC 318J STANLEY VA
2023-03-16 839-236 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 NEWBERRY SC
2023-03-16 854-243 0XXX1XXX2XXX which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - SC 6398 EASTCONWAY SC
2023-03-16 908-569 0–9 XXXall 10 · 3 holders which blocks → FIVE9, INC. 598J SOMERVILLE NJ
2023-03-16 914-392 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 WSCHSTZN02 NY
2023-03-16 945-292 0–9 XXXall 10 · 3 holders which blocks → FIVE9, INC. 598J DALLAS TX
2023-03-15 219-910 0XXX1XXX7XXX8XXX9XXX · 3 holders which blocks → COMMIO, LLC 939H WHEELER IN
2023-03-15 228-227 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 732J BILOXI MS
2023-03-15 314-636 0–9 XXXall 10 · 5 holders which blocks → LEAP TELECOM, LLC 616J OAKVILLE MO
2023-03-15 382-300 not yet reported which blocks → IXICA Communications Inc. 812H Dorchester —
2023-03-15 382-444 not yet reported which blocks → IXICA Communications Inc. 812H Glencoe —
2023-03-15 382-500 not yet reported which blocks → IXICA Communications Inc. 812H Harrietsville —
2023-03-15 382-666 not yet reported which blocks → IXICA Communications Inc. 812H Kerwood —
2023-03-15 382-700 not yet reported which blocks → IXICA Communications Inc. 812H Lambeth —
2023-03-15 382-777 not yet reported which blocks → IXICA Communications Inc. 812H Lucan —
2023-03-15 382-800 not yet reported which blocks → IXICA Communications Inc. 812H Melbourne —
2023-03-15 479-504 0–9 XXXall 10 · 2 holders which blocks → NUSO, LLC 732J BENTONVL AR
2023-03-15 742-887 not yet reported which blocks → Rogers Communications Canada Inc. (Wireless) 8821 Beeton —
2023-03-15 771-224 0–9 XXXall 10 · 3 holders which blocks → FIVE9, INC. 598J WSHNGTNZN1 DC
2023-03-15 854-540 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 3 holders which blocks → COMMIO, LLC 939H RIDGELAND SC
2023-03-15 904-893 0–9 XXXall 10 · 5 holders which blocks → AT&T - LOCAL 7421 JACKSONVL FL
2023-03-14 234-371 1XXX which blocks → COMCAST IP PHONE, LLC 318J CARROLLTON OH
2023-03-14 252-472 0XXX1XXX2XXX9XXX · 4 holders which blocks → AT&T - LOCAL 7421 CONWAY NC
2023-03-14 309-930 1XXX6XXX8XXX9XXX · 3 holders which blocks → NUSO, LLC 732J ROCKISLAND IL
2023-03-14 326-213 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J DAYTON OH
2023-03-14 382-200 not yet reported which blocks → IXICA Communications Inc. 812H Belmont —
2023-03-14 382-222 not yet reported which blocks → IXICA Communications Inc. 812H Exeter —
2023-03-14 382-400 not yet reported which blocks → IXICA Communications Inc. 812H Crediton —
2023-03-14 447-253 0XXX1XXX2XXX3XXX4XXX6XXX8XXX9XXX · 4 holders which blocks → NUSO, LLC 732J BEARDSTOWN IL
2023-03-14 531-316 0–9 XXXall 10 · 3 holders which blocks → NUSO, LLC 732J HASTINGS NE
2023-03-14 551-373 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - NJ 637C UNION CITY NJ

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.