Area code 312
4,686 number blocks indexed across 44 carriers.
States: IL (4,686)
Carriers
| OCN | Company | HQ | Type | Blocks | Recent | Website |
|---|---|---|---|---|---|---|
| 224C | Onvoy LLC | Chicago, IL | Competitive Local Exchange Carrier | 289 | 21 | sinch.com |
| 6333 | Cellco Partnership dba Verizon Wireless - IL | Olathe, KS | Wireless Carrier | 233 | 16 | verizonwireless.com |
| 624H | Onvoy Spectrum LLC | Broomfield, CO | Wireless Carrier | 47 | 6 | |
| 671J | U.S. Telepacific Corporation dba TPx Communications | Las Vegas, NV | IP-Enabled Service / VoIP | 3 | 3 | tpx.com |
| 321J | HD Carrier LLC | Henderson, NV | IP-Enabled Service / VoIP | 2 | 2 | hdcarrier.com |
| 700J | Wavenation LLC | Chicago, IL | IP-Enabled Service / VoIP | 2 | 2 | peerlessnetwork.com |
| 732J | NUSO LLC | University City, MO | IP-Enabled Service / VoIP | 2 | 2 | brightlink.com |
| 197D | Vonage America LLC | Holmdel, NJ | IP-Enabled Service / VoIP | 5 | 1 | vonage.com |
| 9329 | Ameritech Illinois | Hoffman Estates, IL | Regional Bell Operating Company | 1,144 | — | att.com |
| 6529 | T-Mobile USA Inc | Bellevue, WA | Personal Communications Service (Wireless) | 749 | — | t-mobile.com |
| 6534 | New Cingular Wireless PCS LLC - IL | Atlanta, GA | Wireless Carrier | 367 | — | att.com |
| 6115 | Level 3 Communications LLC - IL | Westminster, CO | Competitive Local Exchange Carrier | 365 | — | centurylink.com |
| 984E | Bandwidth.com CLEC LLC - IL | Cary, NC | Competitive Local Exchange Carrier | 284 | — | bandwidth.com |
| 7229 | MCImetro Access Transmission Services LLC | Vienna, VA | Competitive Local Exchange Carrier | 218 | — | verizon.com |
| 5562 | T-Mobile USA Inc | Dallas, TX | Personal Communications Service (Wireless) | 196 | — | metropcs.com |
| 7136 | Teleport Communications America LLC - IL | Staten Island, NY | Competitive Local Exchange Carrier | 165 | — | att.com |
| 460K | First Communications LLC | Oakbrook Terrace, IL | IP-Enabled Service / VoIP | 132 | — | |
| 829J | PAETEC iTel LLC | Charlotte, NC | IP-Enabled Service / VoIP | 122 | — | |
| 063E | Peerless Network of Illinois LLC - IL | Chicago, IL | Competitive Local Exchange Carrier | 70 | — | peerlessnetwork.com |
| 8702 | RCN Telecom Services of Illinios Inc - IL | Chicago, IL | Competitive Local Exchange Carrier | 46 | — | astound.com |
| 318J | Comcast IP Phone LLC | Philadelphia, PA | IP-Enabled Service / VoIP | 42 | — | comcast.com |
| 7196 | MCImetro Access Transmission Services LLC - IL | Vienna, VA | Competitive Local Exchange Carrier | 42 | — | verizon.com |
| 6630 | Spok Inc | Plano, TX | Wireless Carrier | 34 | — | spok.com |
| 5447 | Access One Inc - IL | Chicago, IL | Competitive Local Exchange Carrier | 26 | — | accessoneinc.com |
| 9748 | American Messaging Services LLC | Lewisville, TX | Wireless Carrier | 14 | — | americanmessaging.net |
| MULT | Multiple OCN Listing | Administrative / Reserved | 14 | — | ||
| 138G | Level 3 Telecom of Illinois LLC - IL | Littleton, CO | Competitive Local Exchange Carrier | 10 | — | centurylink.com |
| 7056 | XO Illinois Inc | Reston, VA | Competitive Local Exchange Carrier | 9 | — | verizon.com |
| 7421 | AT&T Local | Bedminster, NJ | Competitive Local Exchange Carrier | 9 | — | att.com |
| 508J | CenturyLink Communications LLC | Littleton, CO | IP-Enabled Service / VoIP | 7 | — | centurylink.com |
| 073H | Telnyx LLC | Chicago, IL | IP-Enabled Service / VoIP | 6 | — | telnyx.com |
| 516C | AT&T Enterprises LLC | San Antonio, TX | IP-Enabled Service / VoIP | 6 | — | att.com |
| 478J | NUSO LLC | Atlanta, GA | IP-Enabled Service / VoIP | 5 | — | brightlink.com |
| 057H | Local Access LLC - IL | Windermere, FL | Competitive Local Exchange Carrier | 2 | — | |
| 148J | Telengy LLC | New York, NY | IP-Enabled Service / VoIP | 2 | — | callcentric.com |
| 156J | RCLEC Inc | Centennial, CO | IP-Enabled Service / VoIP | 2 | — | rclec.com |
| 425J | CSC Wireless LLC | Long Island City, NY | Wireless Carrier | 2 | — | alticeusa.com |
| 495J | Stratus Networks Inc | Peoria Heights, IL | IP-Enabled Service / VoIP | 2 | — | stratusnet.com |
| 551G | NUSO LLC | Atlanta, GA | Wireless Carrier | 2 | — | 365wireless.net |
| 597F | VOIP Innovations LLC | Pittsburgh, PA | IP-Enabled Service / VoIP | 2 | — | voipstreet.com |
| 6795 | Indiana Paging Network Inc | Michigan City, IN | Wireless Carrier | 2 | — | indianapaging.com |
| 965H | Fractel LLC | Indialantic, FL | IP-Enabled Service / VoIP | 2 | — | fractel.net |
| 996H | Airespring Inc | Van Nuys, CA | IP-Enabled Service / VoIP | 2 | — | airespring.com |
| 259E | YMax Communications Corporation - IL | Palm Beach, FL | Competitive Local Exchange Carrier | 1 | — | ymaxcorp.com |