Area code 443
7,298 number blocks indexed across 41 carriers.
States: MD (7,298)
Carriers
| OCN | Company | HQ | Type | Blocks | Recent | Website |
|---|---|---|---|---|---|---|
| 4036 | New Cingular Wireless PCS LLC - DC | Atlanta, GA | Wireless Carrier | 782 | 30 | att.com |
| 876D | Onvoy LLC - MD | Chicago, IL | Competitive Local Exchange Carrier | 482 | 23 | sinch.com |
| 6395 | Cellco Partnership dba Verizon Wireless - MD | Olathe, KS | Wireless Carrier | 1,087 | 16 | verizonwireless.com |
| 6855 | Omnipoint Communications Cap Operations LLC | Cedar Knolls, NJ | Personal Communications Service (Wireless) | 1,182 | 10 | t-mobile.com |
| 145J | Terra Nova Telecom Inc | Lakewood Ranch, FL | IP-Enabled Service / VoIP | 5 | 5 | terranova.net |
| 568G | Peerless Network of Maryland LLC | Chicago, IL | Competitive Local Exchange Carrier | 123 | 2 | peerlessnetwork.com |
| 829J | PAETEC iTel LLC | Charlotte, NC | IP-Enabled Service / VoIP | 767 | — | |
| 071F | Bandwidth.com CLEC LLC - MD | Cary, NC | Competitive Local Exchange Carrier | 463 | — | bandwidth.com |
| 318J | Comcast IP Phone LLC | Philadelphia, PA | IP-Enabled Service / VoIP | 369 | — | comcast.com |
| 6119 | Level 3 Communications LLC - MD | Westminster, CO | Competitive Local Exchange Carrier | 365 | — | centurylink.com |
| 5562 | T-Mobile USA Inc | Dallas, TX | Personal Communications Service (Wireless) | 358 | — | metropcs.com |
| 7229 | MCImetro Access Transmission Services LLC | Vienna, VA | Competitive Local Exchange Carrier | 344 | — | verizon.com |
| 9212 | Verizon Maryland Inc | Falls Church, VA | Regional Bell Operating Company | 272 | — | verizon.com |
| 7325 | Teleport Communications America LLC - MD | Staten Island, NY | Competitive Local Exchange Carrier | 122 | — | att.com |
| 7228 | MCImetro Access Transmission Services LLC - MD | Vienna, VA | Competitive Local Exchange Carrier | 94 | — | verizon.com |
| 082H | Local Access LLC - MD | Windermere, FL | Competitive Local Exchange Carrier | 66 | — | |
| 073H | Telnyx LLC | Chicago, IL | IP-Enabled Service / VoIP | 57 | — | telnyx.com |
| 508J | CenturyLink Communications LLC | Littleton, CO | IP-Enabled Service / VoIP | 56 | — | centurylink.com |
| 624H | Onvoy Spectrum LLC | Broomfield, CO | Wireless Carrier | 47 | — | |
| 2593 | Core Communications Inc - MD | Annapolis, MD | Competitive Local Exchange Carrier | 46 | — | coretel.net |
| 281E | YMax Communications Corporation - MD | Palm Beach, FL | Competitive Local Exchange Carrier | 40 | — | ymaxcorp.com |
| 7591 | Level 3 Telecom of Maryland LLC - MD | Columbia, MD | Competitive Local Exchange Carrier | 23 | — | centurylink.com |
| 6626 | Omnipoint Communications Enterprises LP | Cedar Knolls, NJ | Personal Communications Service (Wireless) | 22 | — | t-mobile.com |
| 321J | HD Carrier LLC | Henderson, NV | IP-Enabled Service / VoIP | 17 | — | hdcarrier.com |
| 939H | Commio LLC | Austin, TX | IP-Enabled Service / VoIP | 16 | — | commio.com |
| 8697 | Baltimore-Washington Telephone (BWT) | Laurel, MD | Competitive Local Exchange Carrier | 15 | — | bwtel.com |
| MULT | Multiple OCN Listing | Administrative / Reserved | 13 | — | ||
| 964H | Barr Tell USA Inc | Long Beach, NY | Competitive Local Exchange Carrier | 12 | — | barrtell.com |
| 228C | IDT America Corporation - MD | Newark, NJ | Underlying Local Exchange Carrier | 9 | — | idt.net |
| 4492 | VDL Inc dba Global Telecom Brokers - MD | Owings Mills, MD | Competitive Local Exchange Carrier | 7 | — | xtel.net |
| 551G | NUSO LLC | Atlanta, GA | Wireless Carrier | 7 | — | 365wireless.net |
| 7421 | AT&T Local | Bedminster, NJ | Competitive Local Exchange Carrier | 5 | — | att.com |
| 197D | Vonage America LLC | Holmdel, NJ | IP-Enabled Service / VoIP | 4 | — | vonage.com |
| 420C | Armstrong Telecommunications Inc - MD | Butler, PA | Competitive Local Exchange Carrier | 4 | — | armstrongonewire.com |
| 4773 | XO Maryland LLC | Reston, VA | Competitive Local Exchange Carrier | 4 | — | verizon.com |
| 2596 | Quantum Telecommunications Inc - MD | Manchester, MD | Competitive Local Exchange Carrier | 3 | — | qis.net |
| 820C | Intrado Communications LLC | Bedminster, NJ | Competitive Local Exchange Carrier | 3 | — | att.com |
| 2554 | Global NAPS South Inc - MD | Norwood, MA | Competitive Local Exchange Carrier | 2 | — | globalnaps.org |
| 490J | Boost SubscriberCo LLC | Washington, DC | Wireless Carrier | 2 | — | dish.com |
| 515J | IP Horizon LLC | Orlando, FL | IP-Enabled Service / VoIP | 2 | — | |
| 861F | MCC Telephony of the Mid-Atlantic LLC - MD | Middletown, NY | Competitive Local Exchange Carrier | 1 | — | mediacomcc.com |