NumberResearch Membership · Data 09/27/2026

Recent prefix assignments

341 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 21
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
2021-02-16 914-435 0–9 XXXall 10 · 5 holders which blocks → UCOMTEL INC. 534J WSCHSTZN08 NY
2021-02-16 914-436 0–9 XXXall 10 · 5 holders which blocks → UCOMTEL INC. 534J YORKTN HTS NY
2021-02-16 914-744 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC- NY 384C MT VERNON NY
2021-02-16 934-203 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → UCOMTEL INC. 534J WESTHAMPTN NY
2021-02-16 937-793 0–9 XXXall 10 · 4 holders which blocks → IP HORIZON LLC 515J DAYTON OH
2021-02-16 939-327 0–9 XXXwhole prefix which blocks → SUNCOM DBA T-MOBILE USA 8645 SANTURCE PR
2021-02-16 959-310 0–9 XXXall 10 · 3 holders which blocks → ONVOY SPECTRUM, LLC 624H BRISTOL CT
2021-02-16 959-410 0–9 XXXall 10 · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H COLCHESTER CT
2021-02-16 959-510 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H COLUMBIA CT
2021-02-16 959-610 0XXX1XXX3XXX4XXX5XXX8XXX9XXX · 5 holders which blocks → ONVOY SPECTRUM, LLC 624H HARWINTON CT
2021-02-16 959-810 0XXX1XXX2XXX3XXX5XXX9XXX · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H MOODUS CT
2021-02-16 959-910 0–9 XXXall 10 · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H MYSTIC CT
2021-02-16 959-951 0–9 XXXall 10 · 6 holders which blocks → ONVOY SPECTRUM, LLC 624H NEW LONDON CT
2021-02-16 970-501 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 DURANGO CO
2021-02-15 386-991 0–9 XXXall 10 · 5 holders which blocks → ONVOY SPECTRUM, LLC 624H ORANGECITY FL
2021-02-15 407-887 0–9 XXXwhole prefix which blocks → ONVOY, LLC - FL 937C KISSIMMEE FL
2021-02-15 727-739 0–9 XXXall 10 · 5 holders which blocks → ONVOY SPECTRUM, LLC 624H STPETERSBG FL
2021-02-15 813-742 0–9 XXXall 10 · 4 holders which blocks → TELNYX LLC 073H TAMPASTH FL
2021-02-15 813-768 0–9 XXXall 10 · 3 holders which blocks → TELNYX LLC 073H TAMPAEST FL
2021-02-12 239-363 0–9 XXXall 10 · 6 holders which blocks → ONVOY SPECTRUM, LLC 624H IMMOKALEE FL
2021-02-12 239-364 0–9 XXXall 10 · 5 holders which blocks → ONVOY SPECTRUM, LLC 624H NO NAPLES FL
2021-02-12 240-934 0–9 XXXall 10 · 6 holders which blocks → TON80 COMMUNICATIONS, LLC 516J MIDDLETOWN MD
2021-02-12 267-964 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - PA 6392 PHPHSBZN43 PA
2021-02-12 313-548 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - MI 991E DETROITZN2 MI
2021-02-12 332-699 0–9 XXXall 10 · 5 holders which blocks → FRACTEL, LLC 965H NWYRCYZN01 NY
2021-02-12 406-504 2XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - MT 9415 FAIRFIELD MT
2021-02-12 447-446 0XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → HD CARRIER LLC 321J CHAMPAURBN IL
2021-02-12 447-448 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 4 holders which blocks → HD CARRIER LLC 321J SPRINGFLD IL
2021-02-12 475-410 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY SPECTRUM, LLC 624H WOODBURY CT
2021-02-12 620-418 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 FORT SCOTT KS
2021-02-12 620-419 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 PRATT KS
2021-02-12 662-431 0XXX1XXX4XXX5XXX6XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MS 5178 GUNTOWN MS
2021-02-12 781-612 0–9 XXXwhole prefix which blocks → TC SYSTEMS, INC. 7135 CANTON MA
2021-02-12 862-359 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 LIVINGSTON NJ
2021-02-12 914-427 0–9 XXXall 10 · 4 holders which blocks → UCOMTEL INC. 534J MOUNTKISCO NY
2021-02-12 914-429 0–9 XXXall 10 · 3 holders which blocks → UCOMTEL INC. 534J MT VERNON NY
2021-02-12 914-430 0–9 XXXall 10 · 4 holders which blocks → UCOMTEL INC. 534J SOUTHSALEM NY
2021-02-12 959-952 0XXX1XXX3XXX4XXX5XXX8XXX9XXX · 6 holders which blocks → ONVOY SPECTRUM, LLC 624H SHARON CT
2021-02-11 224-373 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - IL 6333 DEERFIELD IL
2021-02-11 262-281 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - WI 6508 WAUKESHA WI
2021-02-11 321-477 0–9 XXXall 10 · 7 holders which blocks → FRACTEL, LLC 965H MELBOURNE FL
2021-02-11 385-487 0–9 XXXall 10 · 4 holders which blocks → TON80 COMMUNICATIONS, LLC 516J SALT LAKE UT
2021-02-11 437-290 not yet reported which blocks → Iristel Inc. 154E Toronto —
2021-02-11 437-291 not yet reported which blocks → Iristel Inc. 154E Toronto —
2021-02-11 437-326 not yet reported which blocks → Bell Mobility 6574 Toronto —
2021-02-11 437-784 not yet reported which blocks → TELUS Mobility 8303 Toronto —
2021-02-11 447-234 0XXX4XXX5XXX · 3 holders which blocks → FRACTEL, LLC 965H GIFFORD IL
2021-02-11 447-345 0–9 XXXall 10 · 6 holders which blocks → FRACTEL, LLC 965H CANTRALL IL
2021-02-11 447-477 0XXX1XXX4XXX7XXX8XXX · 5 holders which blocks → FRACTEL, LLC 965H FISHER IL
2021-02-11 470-783 0–9 XXXwhole prefix which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - GA 6540 ATLANTA GA

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.