NumberResearch Membership · Data 09/27/2026

Recent prefix assignments

334 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 19
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
2020-10-26 531-250 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - NE 5807 OMAHA NE
2020-10-26 531-353 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - NE 549E WAHOO NE
2020-10-26 551-290 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 KEARNY NJ
2020-10-26 580-720 0XXX6XXX7XXX · 3 holders which blocks → TELEPORT COMMUNICATIONS AMERICA OK - LLC 530C ELGIN OK
2020-10-26 659-212 0–9 XXXall 10 · 4 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - AL 6804 JASPER AL
2020-10-26 669-304 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → T-MOBILE USA, INC. 6529 MORGANHILL CA
2020-10-26 680-224 0XXX2XXX3XXX4XXX5XXX6XXX9XXX · 4 holders which blocks → TC SYSTEMS, INC. - NY 7140 DE RUYTER NY
2020-10-26 743-205 0–9 XXXall 10 · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - NC 998E BURLINGTON NC
2020-10-26 802-390 0XXX1XXX2XXX3XXX8XXX · 4 holders which blocks → NUSO, LLC 478J NORWICH VT
2020-10-26 804-891 0–9 XXXall 10 · 5 holders which blocks → NUSO, LLC 478J PETERSBURG VA
2020-10-26 872-277 0–9 XXXall 10 · 6 holders which blocks → BANDWIDTH.COM CLEC, LLC - IL 984E CHICGOZN05 IL
2020-10-26 903-993 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → BANDWIDTH.COM CLEC, LLC - TX 004F BENWHEELER TX
2020-10-23 206-644 0–9 XXXwhole prefix which blocks → COMCAST IP PHONE, LLC 318J SEATTLE WA
2020-10-23 206-657 0–9 XXXall 10 · 4 holders which blocks → METROPCS, INC. 5562 SEATTLE WA
2020-10-23 207-849 0–9 XXXall 10 · 4 holders which blocks → BELL ATLANTIC MOBILE, INC 6386 KENNEBUNK ME
2020-10-23 380-220 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - OH 464C WESTERVL OH
2020-10-23 380-221 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - OH 464C WJEFFERSON OH
2020-10-23 458-895 0–9 XXXall 10 · 4 holders which blocks → TWILIO INTERNATIONAL, INC. 506J EUGENE OR
2020-10-23 469-966 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - TX 903C KAUFMAN TX
2020-10-23 505-895 0–9 XXXall 10 · 4 holders which blocks → TWILIO INTERNATIONAL, INC. 506J ALBUQURQUE NM
2020-10-23 509-601 0–9 XXXall 10 · 3 holders which blocks → TWILIO INTERNATIONAL, INC. 506J SPOKANE WA
2020-10-23 561-576 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J BOCA RATON FL
2020-10-23 563-895 0–9 XXXall 10 · 5 holders which blocks → TWILIO INTERNATIONAL, INC. 506J DAVENPORT IA
2020-10-23 605-601 0–9 XXXall 10 · 5 holders which blocks → TWILIO INTERNATIONAL, INC. 506J SIOUX FLS SD
2020-10-23 659-210 0–9 XXXall 10 · 5 holders which blocks → POWERTEL BIRMINGHAM LICENSES, INC. 7475 TUSCALOOSA AL
2020-10-23 681-301 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - WV 449F FAYETTEVL WV
2020-10-23 681-671 0XXX1XXX2XXX3XXX6XXX7XXX · 4 holders which blocks → ONVOY, LLC - WV 449F GRIFITHSVL WV
2020-10-23 681-685 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - WV 449F GASSAWAY WV
2020-10-23 720-764 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 5 holders which blocks → ONVOY, LLC - CO 026D HUDSON CO
2020-10-23 725-240 0–9 XXXall 10 · 2 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 LAS VEGAS NV
2020-10-23 734-361 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 2 holders which blocks → ONVOY, LLCV - MI 543C MAYBEE MI
2020-10-23 775-462 0–9 XXXall 10 · 5 holders which blocks → CSC WIRELESS, LLC 425J RENO NV
2020-10-23 810-261 0XXX1XXX2XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLCV - MI 543C RANKIN MI
2020-10-23 813-723 0–9 XXXall 10 · 2 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 TAMPANTH FL
2020-10-23 838-226 0XXX2XXX3XXX4XXX5XXX6XXX7XXX · 5 holders which blocks → TC SYSTEMS, INC. - NY 7140 KEESEVILLE NY
2020-10-23 845-816 0–9 XXXall 10 · 6 holders which blocks → TC SYSTEMS, INC. - NY 7140 CHESTER NY
2020-10-23 930-220 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - IN 4803 COLUMBUS IN
2020-10-23 970-502 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - CO 6567 GREELEY CO
2020-10-23 989-360 0XXX1XXX2XXX3XXX4XXX · 4 holders which blocks → ONVOY, LLCV - MI 543C HEMLOCK MI
2020-10-22 223-895 0–9 XXXall 10 · 4 holders which blocks → TWILIO INTERNATIONAL, INC. 506J HARISBGZN1 PA
2020-10-22 229-267 0–9 XXXall 10 · 2 holders which blocks → ONVOY, LLC - GA 067D THOMASVL GA
2020-10-22 236-691 not yet reported which blocks → Bell West Inc. 2933 Creston —
2020-10-22 236-692 not yet reported which blocks → Bell West Inc. 2933 Fernie —
2020-10-22 236-693 not yet reported which blocks → Bell West Inc. 2933 Golden —
2020-10-22 236-694 not yet reported which blocks → Bell West Inc. 2933 Invermere —
2020-10-22 236-695 not yet reported which blocks → Bell West Inc. 2933 Kimberley —
2020-10-22 236-696 not yet reported which blocks → Bell West Inc. 2933 Sparwood —
2020-10-22 236-697 not yet reported which blocks → Bell West Inc. 2933 Nakusp —
2020-10-22 236-698 not yet reported which blocks → Bell West Inc. 2933 Castlegar —
2020-10-22 253-523 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - WA 483E TACOMAWVLY WA

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.