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
2005-01-06 919-744 0–9 XXXall 10 · 2 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 RALEIGH NC
2005-01-06 936-222 not yet reported which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 CROCKETT TX
2005-01-06 937-529 0–9 XXXall 10 · 7 holders which blocks → METROPCS, INC. 5562 TROTWOOD OH
2005-01-05 206-257 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J SEATTLE WA
2005-01-05 406-694 0–9 XXXall 10 · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MT 6564 BILLINGS MT
2005-01-05 409-377 6XXX7XXX8XXX · 2 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - TX 6506 SPURGER TX
2005-01-05 480-747 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 PHOENIX AZ
2005-01-05 801-349 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SALT LAKE UT
2005-01-05 808-457 0–9 XXXall 10 · 3 holders which blocks → T-MOBILE USA, INC. 6529 HONOLULU HI
2005-01-05 912-304 0–9 XXXall 10 · 6 holders which blocks → MCC TELEPHONY LLC 593K LUMBERCITY GA
2005-01-04 214-881 0–9 XXXwhole prefix which blocks → METROPCS, INC. 5562 DALLAS TX
2005-01-04 303-500 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - CO 6118 HUDSON CO
2005-01-04 678-899 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - GA 6116 ADAIRSVL GA
2005-01-04 678-956 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - GA 6116 ADAIRSVL GA
2005-01-04 787-662 0–9 XXXwhole prefix which blocks → SUNCOM DBA T-MOBILE USA 8645 SANTURCE PR
2005-01-04 815-989 0–9 XXXall 10 · 8 holders which blocks → MEDIACOM TELEPHONY OF ILLINOIS, LLC - IL 846F PROPHETSTN IL
2005-01-03 207-608 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - DC 4036 SANFORD ME
2005-01-03 310-986 0–9 XXXall 10 · 5 holders which blocks → T-MOBILE USA, INC. 6529 LOMITA CA
2005-01-03 530-588 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 CHICO CA
2005-01-03 562-657 0–9 XXXwhole prefix which blocks → PACIFIC BELL (COMPETITIVE) 7480 DOWNEY CA
2005-01-03 571-527 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J WSNGTNZN08 VA
2005-01-03 760-780 0–9 XXXall 10 · 6 holders which blocks → CHARTER IP ENABLED SERVICES, LLC 792K VICTORVL CA
2005-01-03 909-697 0–9 XXXall 10 · 6 holders which blocks → T-MOBILE USA, INC. 6529 FONTANA CA
2005-01-03 914-437 0–9 XXXall 10 · 4 holders which blocks → CSC VOICE, LLC 612K WSCHSTZN08 NY
2005-01-03 916-873 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 SCRM MAIN CA
2004-12-30 360-572 0–9 XXXall 10 · 5 holders which blocks → COMCAST IP PHONE, LLC 318J MARYSVILLE WA
2004-12-30 418-619 not yet reported which blocks → Videotron Ltd. 8306 St-Nicolas —
2004-12-30 418-761 not yet reported which blocks → Videotron Ltd. 8306 Charny —
2004-12-30 573-464 3XXX6XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 CALIFORNIA MO
2004-12-30 573-622 0XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 CLARKSBURG MO
2004-12-30 614-670 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 COLUMBUS OH
2004-12-30 660-242 2XXX5XXX6XXX7XXX8XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 MONTROSE MO
2004-12-30 660-279 0XXX1XXX2XXX3XXX5XXX6XXX7XXX · 7 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 BLACKBURN MO
2004-12-30 660-283 0XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 BLAIRSTOWN MO
2004-12-30 660-319 none assigned yet which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 MALTA BEND MO
2004-12-30 660-333 0XXX3XXX7XXX8XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 OTTERVILLE MO
2004-12-30 660-431 none assigned yet which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 SMITHTON MO
2004-12-30 660-474 0XXX1XXX7XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 LEETON MO
2004-12-30 660-515 0XXX1XXX3XXX5XXX6XXX8XXX9XXX · 4 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 SWEET SPG MO
2004-12-30 660-552 0XXX5XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 KING CITY MO
2004-12-30 660-616 0XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 TIPTON MO
2004-12-30 660-655 1XXX5XXX6XXX7XXX · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 HOUSTONIA MO
2004-12-30 660-722 0XXX2XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 URICH MO
2004-12-30 660-797 0XXX7XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 GREENRIDGE MO
2004-12-30 660-847 6XXX7XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 CALHOUN MO
2004-12-30 660-889 9XXX which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 DEEPWATER MO
2004-12-30 660-906 none assigned yet which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 SYRACUSE MO
2004-12-30 660-952 1XXX5XXX6XXX · 2 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - MO 4932 CHILHOWEE MO
2004-12-30 773-530 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J CHICGOZN09 IL
2004-12-30 815-893 0–9 XXXall 10 · 7 holders which blocks → COMCAST IP PHONE, LLC 318J CRYSTAL LK IL

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.