NumberResearch Membership · Data 09/29/2026

Recent prefix assignments

347 prefixes assigned in the last 30 days · from the daily NANPA CO code file, 09/29/2026

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
Rogers Communications Canada Inc. (Wireless) 23
NEW CINGULAR WIRELESS PCS, LLC - IL 23
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
2017-09-19 518-716 7XXX8XXX · 2 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J CANAJOHARI NY
2017-09-19 548-220 not yet reported which blocks → TELUS Integrated Communications 2782 Harriston —
2017-09-19 548-221 not yet reported which blocks → TELUS Integrated Communications 2782 Mitchell —
2017-09-19 548-222 not yet reported which blocks → TELUS Integrated Communications 2782 Palmerston —
2017-09-19 548-223 not yet reported which blocks → TELUS Integrated Communications 2782 Tavistock —
2017-09-19 618-312 0XXX1XXX2XXX3XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → WABASH INDEPENDENT NETWORKS, INC DBA WABASH COMM 772H SALEM IL
2017-09-19 737-227 0–9 XXXall 10 · 7 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J WIMBERLEY TX
2017-09-19 810-322 0–9 XXXall 10 · 5 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - IL 6534 LAPEER MI
2017-09-19 949-317 0–9 XXXall 10 · 6 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L SADLBK VLY CA
2017-09-18 239-203 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 FTMYERSBCH FL
2017-09-18 343-241 not yet reported which blocks → TELUS Integrated Communications 2782 Barry's Bay —
2017-09-18 343-242 not yet reported which blocks → TELUS Integrated Communications 2782 Calabogie —
2017-09-18 343-243 not yet reported which blocks → TELUS Integrated Communications 2782 Cobden —
2017-09-18 343-245 not yet reported which blocks → TELUS Integrated Communications 2782 Deep River —
2017-09-18 343-246 not yet reported which blocks → TELUS Integrated Communications 2782 Eganville —
2017-09-18 343-247 not yet reported which blocks → TELUS Integrated Communications 2782 Killaloe —
2017-09-18 343-248 not yet reported which blocks → TELUS Integrated Communications 2782 Whitney —
2017-09-18 361-223 0–9 XXXall 10 · 4 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 BENAVIDES TX
2017-09-18 484-677 0XXX1XXX2XXX3XXX4XXX6XXX7XXX · 7 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J BANGOR PA
2017-09-18 484-912 0XXX1XXX5XXX7XXX · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J PEN ARGYL PA
2017-09-18 571-362 0–9 XXXwhole prefix which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 HERNDON VA
2017-09-18 602-598 0–9 XXXall 10 · 5 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J PHOENIX AZ
2017-09-18 610-445 0XXX2XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 4 holders which blocks → CENTURYLINK COMMUNICATIONS, LLC 508J BELVIDERE PA
2017-09-18 619-349 0–9 XXXall 10 · 4 holders which blocks → COMCAST PHONE OF CALIFORNIA, LLC 394L CHULAVISTA CA
2017-09-15 220-444 0XXX1XXX2XXX4XXX8XXX9XXX · 4 holders which blocks → ONVOY, LLC - OH 464C MINGO JCT OH
2017-09-15 220-999 0XXX1XXX3XXX4XXX5XXX6XXX7XXX8XXX9XXX · 6 holders which blocks → ONVOY, LLC - OH 464C NEWPORT OH
2017-09-15 240-537 0–9 XXXall 10 · 4 holders which blocks → ATLANTECH ONLINE, INC. - MD 361H HAGERSTOWN MD
2017-09-15 480-702 0–9 XXXall 10 · 3 holders which blocks → COMCAST IP PHONE, LLC 318J PHOENIX AZ
2017-09-15 504-354 0–9 XXXall 10 · 4 holders which blocks → TELEPORT COMMUNICATIONS AMERICA LA - LLC 653C NEWORLEANS LA
2017-09-15 573-890 0XXX1XXX2XXX3XXX4XXX5XXX7XXX8XXX9XXX · 3 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - MO 5814 FULTON MO
2017-09-15 667-227 0–9 XXXall 10 · 5 holders which blocks → ATLANTECH ONLINE, INC. - MD 361H SALISBURY MD
2017-09-15 862-465 0–9 XXXall 10 · 6 holders which blocks → CABLEVISION LIGHTPATH, INC. - NJ 4948 MADISON NJ
2017-09-14 206-742 0–9 XXXall 10 · 3 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 DES MOINES WA
2017-09-14 219-245 0–9 XXXall 10 · 3 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC - IN 7440 WHEELER IN
2017-09-14 219-500 0–9 XXXall 10 · 4 holders which blocks → ONVOY, LLC - IN 097D MERRILLVL IN
2017-09-14 219-666 0–9 XXXall 10 · 5 holders which blocks → ONVOY, LLC - IN 097D HAMMOND IN
2017-09-14 407-457 0–9 XXXall 10 · 5 holders which blocks → CELLCO PARTNERSHIP DBA VERIZON WIRELESS - FL 6502 WINTERPARK FL
2017-09-14 425-447 0–9 XXXwhole prefix which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KIRKLAND WA
2017-09-14 425-544 0–9 XXXwhole prefix which blocks → ZIPLY FIBER NORTHWEST, LLC DBA ZIPLY FIBER 4324 KIRKLAND WA
2017-09-14 470-799 0–9 XXXall 10 · 3 holders which blocks → LEVEL 3 COMMUNICATIONS, LLC - GA 6116 ATLANTA NE GA
2017-09-14 484-867 0–9 XXXall 10 · 7 holders which blocks → OMNIPOINT COMMUNICATIONS ENTERPRISES, LP 6626 EASTON PA
2017-09-14 571-616 0–9 XXXall 10 · 5 holders which blocks → MCIMETRO ACCESS TRANSMISSION SERVICES LLC 7229 ENGLESIDE VA
2017-09-14 606-825 0–9 XXXall 10 · 5 holders which blocks → TWC IP ENABLED SERVICES, LLC 793K WILLIAMSBG KY
2017-09-14 747-262 0–9 XXXall 10 · 5 holders which blocks → METROPCS NETWORKS, LLC 899D VAN NUYS CA
2017-09-14 971-294 0–9 XXXall 10 · 4 holders which blocks → NEW CINGULAR WIRELESS PCS, LLC 6010 BEAVERTON OR
2017-09-13 201-732 0–9 XXXall 10 · 2 holders which blocks → CABLEVISION LIGHTPATH, INC. - NJ 4948 HACKENSACK NJ
2017-09-13 431-295 not yet reported which blocks → Bell Mobility 6574 Virden —
2017-09-13 437-377 not yet reported which blocks → IXICA Communications Inc. 812H Toronto —
2017-09-13 470-687 0–9 XXXwhole prefix which blocks → NEW CINGULAR WIRELESS PCS, LLC - GA 6214 ATLANTA NE GA
2017-09-13 602-699 0–9 XXXall 10 · 2 holders which blocks → METROPCS, INC. 5562 PHOENIX AZ

Source: NANPA CO Code Assignments (Utilized, All States, Public), file date 09/29/2026 — Tier A primary source, refreshed on every import. Viewing is free; bulk downloads require a membership.