Area code 203
5,468 number blocks indexed across 35 carriers.
States: CT (5,468)
Carriers
| OCN | Company | HQ | Type | Blocks | Recent | Website |
|---|---|---|---|---|---|---|
| 624H | Onvoy Spectrum LLC | Broomfield, CO | Wireless Carrier | 46 | 5 | |
| 6624 | Omnipoint Communications Inc - CT | Wayne, NJ | Personal Communications Service (Wireless) | 550 | 3 | t-mobile.com |
| 4036 | New Cingular Wireless PCS LLC - DC | Atlanta, GA | Wireless Carrier | 373 | 1 | att.com |
| 199F | Bandwidth.com CLEC LLC - CT | Cary, NC | Competitive Local Exchange Carrier | 319 | 1 | bandwidth.com |
| 639C | Onvoy LLC - CT | Chicago, IL | Competitive Local Exchange Carrier | 105 | 1 | sinch.com |
| 145J | Terra Nova Telecom Inc | Lakewood Ranch, FL | IP-Enabled Service / VoIP | 1 | 1 | terranova.net |
| 321J | HD Carrier LLC | Henderson, NV | IP-Enabled Service / VoIP | 1 | 1 | hdcarrier.com |
| 9147 | Southern New England Telephone Company dba Frontier Communications of Connecticut | Dallas, TX | Regional Bell Operating Company | 1,293 | — | frontier.com |
| 6388 | Cellco Partnership dba Verizon Wireless - CT | Olathe, KS | Wireless Carrier | 522 | — | verizonwireless.com |
| 829J | PAETEC iTel LLC | Charlotte, NC | IP-Enabled Service / VoIP | 393 | — | |
| 5562 | T-Mobile USA Inc | Dallas, TX | Personal Communications Service (Wireless) | 335 | — | metropcs.com |
| 4800 | Level 3 Communications LLC - CT | Westminster, CO | Competitive Local Exchange Carrier | 302 | — | centurylink.com |
| 7230 | MCImetro Access Transmission Services LLC - CT | Vienna, VA | Competitive Local Exchange Carrier | 301 | — | verizon.com |
| 4950 | Cablevision Lightpath Inc - CT | Hicksville, NY | Competitive Local Exchange Carrier | 193 | — | altice.com |
| 7143 | Teleport Communications America LLC - CT | Staten Island, NY | Competitive Local Exchange Carrier | 142 | — | att.com |
| 612K | CSC Voice LLC | Bethpage, NY | IP-Enabled Service / VoIP | 138 | — | |
| 318J | Comcast IP Phone LLC | Philadelphia, PA | IP-Enabled Service / VoIP | 101 | — | comcast.com |
| 539F | Peerless Network of Connecticut LLC - CT | Chicago, IL | Competitive Local Exchange Carrier | 89 | — | peerlessnetwork.com |
| 350E | YMax Communications Corporation - CT | Palm Beach, FL | Competitive Local Exchange Carrier | 62 | — | ymaxcorp.com |
| 9104 | Verizon New York Inc | Boston, MA | Regional Bell Operating Company | 56 | — | verizon.com |
| 7229 | MCImetro Access Transmission Services LLC | Vienna, VA | Competitive Local Exchange Carrier | 39 | — | verizon.com |
| 7421 | AT&T Local | Bedminster, NJ | Competitive Local Exchange Carrier | 26 | — | att.com |
| 508J | CenturyLink Communications LLC | Littleton, CO | IP-Enabled Service / VoIP | 19 | — | centurylink.com |
| 792K | Charter IP Enabled Services LLC | Saint Louis, MO | IP-Enabled Service / VoIP | 15 | — | |
| MULT | Multiple OCN Listing | Administrative / Reserved | 14 | — | ||
| 6630 | Spok Inc | Plano, TX | Wireless Carrier | 10 | — | spok.com |
| 7140 | TC Systems Inc - NY | Staten Island, NY | Competitive Local Exchange Carrier | 7 | — | att.com |
| 9748 | American Messaging Services LLC | Lewisville, TX | Wireless Carrier | 4 | — | americanmessaging.net |
| 073H | Telnyx LLC | Chicago, IL | IP-Enabled Service / VoIP | 3 | — | telnyx.com |
| 7316 | MCImetro Access Transmission Services LLC - CT | Vienna, VA | Competitive Local Exchange Carrier | 3 | — | verizon.com |
| 6622 | Omnipoint Communications Inc - NY | Wayne, NJ | Personal Communications Service (Wireless) | 2 | — | t-mobile.com |
| 506J | Twilio International Inc | San Francisco, CA | IP-Enabled Service / VoIP | 1 | — | twilio.com |
| 516J | Ton80 Communications LLC | Anderson, SC | IP-Enabled Service / VoIP | 1 | — | coretel.net |
| 525G | Barr Tell USA Inc - NY | Long Beach, NY | Competitive Local Exchange Carrier | 1 | — | barrtell.com |
| 939H | Commio LLC | Austin, TX | IP-Enabled Service / VoIP | 1 | — | commio.com |