Area code 240
7,522 number blocks indexed across 51 carriers.
States: MD (7,522)
Carriers
| OCN | Company | HQ | Type | Blocks | Recent | Website |
|---|---|---|---|---|---|---|
| 876D | Onvoy LLC - MD | Chicago, IL | Competitive Local Exchange Carrier | 966 | 28 | sinch.com |
| 6855 | Omnipoint Communications Cap Operations LLC | Cedar Knolls, NJ | Personal Communications Service (Wireless) | 1,367 | 15 | t-mobile.com |
| 6395 | Cellco Partnership dba Verizon Wireless - MD | Olathe, KS | Wireless Carrier | 750 | 9 | verizonwireless.com |
| 4036 | New Cingular Wireless PCS LLC - DC | Atlanta, GA | Wireless Carrier | 719 | 5 | att.com |
| 071F | Bandwidth.com CLEC LLC - MD | Cary, NC | Competitive Local Exchange Carrier | 549 | 3 | bandwidth.com |
| 7325 | Teleport Communications America LLC - MD | Staten Island, NY | Competitive Local Exchange Carrier | 65 | 2 | att.com |
| 145J | Terra Nova Telecom Inc | Lakewood Ranch, FL | IP-Enabled Service / VoIP | 5 | 2 | terranova.net |
| 829J | PAETEC iTel LLC | Charlotte, NC | IP-Enabled Service / VoIP | 403 | — | |
| 6119 | Level 3 Communications LLC - MD | Westminster, CO | Competitive Local Exchange Carrier | 369 | — | centurylink.com |
| 5562 | T-Mobile USA Inc | Dallas, TX | Personal Communications Service (Wireless) | 320 | — | metropcs.com |
| 7229 | MCImetro Access Transmission Services LLC | Vienna, VA | Competitive Local Exchange Carrier | 298 | — | verizon.com |
| 318J | Comcast IP Phone LLC | Philadelphia, PA | IP-Enabled Service / VoIP | 275 | — | comcast.com |
| 9212 | Verizon Maryland Inc | Falls Church, VA | Regional Bell Operating Company | 258 | — | verizon.com |
| 624H | Onvoy Spectrum LLC | Broomfield, CO | Wireless Carrier | 238 | — | |
| 568G | Peerless Network of Maryland LLC | Chicago, IL | Competitive Local Exchange Carrier | 210 | — | peerlessnetwork.com |
| 073H | Telnyx LLC | Chicago, IL | IP-Enabled Service / VoIP | 80 | — | telnyx.com |
| 2593 | Core Communications Inc - MD | Annapolis, MD | Competitive Local Exchange Carrier | 67 | — | coretel.net |
| 939H | Commio LLC | Austin, TX | IP-Enabled Service / VoIP | 55 | — | commio.com |
| 281E | YMax Communications Corporation - MD | Palm Beach, FL | Competitive Local Exchange Carrier | 52 | — | ymaxcorp.com |
| 7228 | MCImetro Access Transmission Services LLC - MD | Vienna, VA | Competitive Local Exchange Carrier | 45 | — | verizon.com |
| 197D | Vonage America LLC | Holmdel, NJ | IP-Enabled Service / VoIP | 41 | — | vonage.com |
| 082H | Local Access LLC - MD | Windermere, FL | Competitive Local Exchange Carrier | 40 | — | |
| 508J | CenturyLink Communications LLC | Littleton, CO | IP-Enabled Service / VoIP | 37 | — | centurylink.com |
| 7529 | Teleport Communications America LLC - DC | Staten Island, NY | Competitive Local Exchange Carrier | 35 | — | att.com |
| 8832 | Starpower Communications LLC - MD | Princeton, NJ | Competitive Local Exchange Carrier | 33 | — | astound.com |
| 516J | Ton80 Communications LLC | Anderson, SC | IP-Enabled Service / VoIP | 32 | — | coretel.net |
| 4720 | USCOC of Cumberland Inc dba United States Cellular - MD | Chicago, IL | Wireless Carrier | 25 | — | uscellular.com |
| 551G | NUSO LLC | Atlanta, GA | Wireless Carrier | 23 | — | 365wireless.net |
| 7591 | Level 3 Telecom of Maryland LLC - MD | Columbia, MD | Competitive Local Exchange Carrier | 20 | — | centurylink.com |
| 361H | Atlantech Online Inc - MD | Silver Spring, MD | Competitive Local Exchange Carrier | 15 | — | atlantech.net |
| 490J | Boost SubscriberCo LLC | Washington, DC | Wireless Carrier | 15 | — | dish.com |
| 8697 | Baltimore-Washington Telephone (BWT) | Laurel, MD | Competitive Local Exchange Carrier | 13 | — | bwtel.com |
| MULT | Multiple OCN Listing | Administrative / Reserved | 13 | — | ||
| 321J | HD Carrier LLC | Henderson, NV | IP-Enabled Service / VoIP | 11 | — | hdcarrier.com |
| 965H | Fractel LLC | Indialantic, FL | IP-Enabled Service / VoIP | 11 | — | fractel.net |
| 228C | IDT America Corporation - MD | Newark, NJ | Underlying Local Exchange Carrier | 10 | — | idt.net |
| 732J | NUSO LLC | University City, MO | IP-Enabled Service / VoIP | 8 | — | brightlink.com |
| 964H | Barr Tell USA Inc | Long Beach, NY | Competitive Local Exchange Carrier | 8 | — | barrtell.com |
| 478J | NUSO LLC | Atlanta, GA | IP-Enabled Service / VoIP | 7 | — | brightlink.com |
| 836G | Shentel Communications LLC - MD | Edinburg, VA | Competitive Local Exchange Carrier | 7 | — | shentel.com |
| 4492 | VDL Inc dba Global Telecom Brokers - MD | Owings Mills, MD | Competitive Local Exchange Carrier | 6 | — | xtel.net |
| 181J | Advanced Telecom Solutions LLC | Bethesda, MD | IP-Enabled Service / VoIP | 4 | — | turbobridge.com |
| 469J | Coretel Maryland Inc - MD | Anderson, SC | Competitive Local Exchange Carrier | 4 | — | coretel.net |
| 425J | CSC Wireless LLC | Long Island City, NY | Wireless Carrier | 2 | — | alticeusa.com |
| 506J | Twilio International Inc | San Francisco, CA | IP-Enabled Service / VoIP | 2 | — | twilio.com |
| 507J | The Voice Application Network LLC | El Segundo, CA | IP-Enabled Service / VoIP | 2 | — | widevoice.com |
| 7421 | AT&T Local | Bedminster, NJ | Competitive Local Exchange Carrier | 2 | — | att.com |
| 996H | Airespring Inc | Van Nuys, CA | IP-Enabled Service / VoIP | 2 | — | airespring.com |
| 074F | Bandwidth.com CLEC LLC - DC | Cary, NC | Competitive Local Exchange Carrier | 1 | — | bandwidth.com |
| 515J | IP Horizon LLC | Orlando, FL | IP-Enabled Service / VoIP | 1 | — | |
| 8605 | MTE Inc dba MTE Paging Network | Falls Church, VA | Wireless Carrier | 1 | — |