NumberResearch Membership · Data 09/26/2026

Recent prefix assignments

360 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/26/2026

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 28
ONVOY, LLC - CA 26
NEW CINGULAR WIRELESS PCS, LLC - IL 26
Rogers Communications Canada Inc. (Wireless) 23
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
2014-02-07 646-767 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 NWYRCYZN01 NY
2014-02-07 857-702 0–9 XXXall 10 · 4 holders which blocks → NUSO, LLC 551G BOSTON MA
2014-02-07 913-247 1XXX3XXX4XXX6XXX7XXX · 5 holders which blocks → CSC VOICE, LLC 612K SPRINGHILL KS
2014-02-06 208-408 0–9 XXXall 10 · 6 holders which blocks → CTC TELECOM, INC. 4032 CASCADE ID
2014-02-06 318-612 0–9 XXXall 10 · 5 holders which blocks → CSC VOICE, LLC 612K BOYCE LA
2014-02-06 336-850 0–9 XXXall 10 · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J MONTICELLO NC
2014-02-06 405-825 0–9 XXXall 10 · 7 holders which blocks → CSC VOICE, LLC 612K CHICKASHA OK
2014-02-06 405-939 0–9 XXXall 10 · 7 holders which blocks → CSC VOICE, LLC 612K PERKINS OK
2014-02-06 406-438 0–9 XXXall 10 · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 HELENA MT
2014-02-06 417-308 0–9 XXXall 10 · 7 holders which blocks → CSC VOICE, LLC 612K AURORA MO
2014-02-06 435-223 not yet reported which blocks → SOUTH CENTRAL COMM -TELCOM SERVICES, LLC UT 380F BRIAN HEAD UT
2014-02-06 469-930 0–9 XXXall 10 · 4 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K DALLAS TX
2014-02-06 541-843 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 JACKSONVL OR
2014-02-06 740-860 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 5 holders which blocks → CSC VOICE, LLC 612K BELPRE OH
2014-02-06 928-299 0–9 XXXall 10 · 4 holders which blocks → CSC VOICE, LLC 612K BULLHEADCY AZ
2014-02-06 928-529 0–9 XXXall 10 · 4 holders which blocks → CSC VOICE, LLC 612K KINGMAN AZ
2014-02-05 484-509 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J READING PA
2014-02-05 520-606 0–9 XXXall 10 · 6 holders which blocks → METROPCS, INC. 5562 TUCSON AZ
2014-02-05 701-601 not yet reported which blocks → SAGEBRUSH CELLULAR, INC. 443B FORTUNA ND
2014-02-05 703-559 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 WSNGTNZN17 VA
2014-02-05 727-203 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 NWPTRICHEY FL
2014-02-04 440-732 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 STRONGSVL OH
2014-02-04 516-259 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC- NY 384C NASSAUZN03 NY
2014-02-04 575-329 0–9 XXXall 10 · 7 holders which blocks → CEBRIDGE TELECOM NM, LLC DBA SUDDENLINK COMM NM 243H CANNON AFB NM
2014-02-04 936-701 0–9 XXXall 10 · 4 holders which blocks → CSC VOICE, LLC 612K WILLIS TX
2014-02-03 346-247 0–9 XXXall 10 · 3 holders which blocks → ONVOY, LLC - TX 903C HOUSTON TX
2014-02-03 430-702 0–9 XXXall 10 · 5 holders which blocks → CSC VOICE, LLC 612K GLADEWATER TX
2014-02-03 440-351 0–9 XXXall 10 · 2 holders which blocks → T-MOBILE USA, INC. 6529 BEREA OH
2014-02-03 512-598 0–9 XXXall 10 · 6 holders which blocks → CSC VOICE, LLC 612K JARRELL TX
2014-02-03 512-969 0–9 XXXall 10 · 4 holders which blocks → CSC VOICE, LLC 612K AUSTIN TX
2014-02-03 903-492 0–9 XXXall 10 · 6 holders which blocks → CSC VOICE, LLC 612K QUITMAN TX
2014-02-03 903-608 0XXX1XXX3XXX4XXX6XXX9XXX · 4 holders which blocks → CSC VOICE, LLC 612K TLSVNPONTS TX
2014-01-31 204-517 not yet reported which blocks → TELUS Integrated Communications 2782 Libau —
2014-01-31 308-252 1XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 8 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - NE 7144 NO PLATTE NE
2014-01-31 430-701 0XXX1XXX2XXX3XXX5XXX8XXX · 5 holders which blocks → CSC VOICE, LLC 612K HUGHES SPG TX
2014-01-31 815-205 0–9 XXXall 10 · 3 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J COAL CITY IL
2014-01-31 818-860 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 BRBN BRBN CA
2014-01-31 903-605 0XXX1XXX2XXX3XXX4XXX6XXX7XXX · 2 holders which blocks → CSC VOICE, LLC 612K LONE STAR TX
2014-01-31 903-800 1XXX2XXX4XXX5XXX6XXX7XXX8XXX · 4 holders which blocks → CSC VOICE, LLC 612K DAINGERFLD TX
2014-01-31 912-216 0XXX1XXX2XXX3XXX4XXX5XXX6XXX7XXX9XXX · 6 holders which blocks → TELEPORT COMMUNICATIONS AMERICA, LLC - GA 8392 LYONS GA
2014-01-30 269-309 0–9 XXXall 10 · 4 holders which blocks → MEI TELECOM, INC. - MI 194H HASTINGS MI
2014-01-30 423-701 0XXX1XXX2XXX8XXX · 3 holders which blocks → UNITED STATES CELLULAR - TN 6278 ROBBINS TN
2014-01-30 470-319 0XXX1XXX2XXX3XXX4XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → PAETEC ITEL, LLC 829J BOWDON GA
2014-01-30 501-703 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 LONOKE AR
2014-01-30 762-349 0–9 XXXall 10 · 6 holders which blocks → ETC COMMUNICATIONS, L.L.C. - GA 205D YOUNGHRRIS GA
2014-01-30 863-208 0–9 XXXall 10 · 6 holders which blocks → ONVOY, LLC - FL 937C OKEECHOBEE FL
2014-01-30 863-210 0–9 XXXall 10 · 4 holders which blocks → AERIAL COMMUNICATIONS, INC. 6701 LAKELAND FL
2014-01-29 214-304 0–9 XXXall 10 · 6 holders which blocks → CSC VOICE, LLC 612K ROCKWALL TX
2014-01-29 214-305 0–9 XXXall 10 · 6 holders which blocks → CSC VOICE, LLC 612K PROSPER TX
2014-01-29 214-307 0–9 XXXall 10 · 5 holders which blocks → CSC VOICE, LLC 612K MCKINNEY TX

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/26/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.