Area code 301
4,587 number blocks indexed across 42 carriers.
States: MD (4,587)
Carriers
| OCN | Company | HQ | Type | Blocks | Recent | Website |
|---|---|---|---|---|---|---|
| 876D | Onvoy LLC - MD | Chicago, IL | Competitive Local Exchange Carrier | 262 | 18 | sinch.com |
| 6855 | Omnipoint Communications Cap Operations LLC | Cedar Knolls, NJ | Personal Communications Service (Wireless) | 453 | 6 | t-mobile.com |
| 071F | Bandwidth.com CLEC LLC - MD | Cary, NC | Competitive Local Exchange Carrier | 250 | 2 | bandwidth.com |
| 6395 | Cellco Partnership dba Verizon Wireless - MD | Olathe, KS | Wireless Carrier | 263 | 1 | verizonwireless.com |
| 145J | Terra Nova Telecom Inc | Lakewood Ranch, FL | IP-Enabled Service / VoIP | 1 | 1 | terranova.net |
| 9212 | Verizon Maryland Inc | Falls Church, VA | Regional Bell Operating Company | 1,752 | — | verizon.com |
| 4036 | New Cingular Wireless PCS LLC - DC | Atlanta, GA | Wireless Carrier | 237 | — | att.com |
| 7229 | MCImetro Access Transmission Services LLC | Vienna, VA | Competitive Local Exchange Carrier | 221 | — | verizon.com |
| 5562 | T-Mobile USA Inc | Dallas, TX | Personal Communications Service (Wireless) | 189 | — | metropcs.com |
| 829J | PAETEC iTel LLC | Charlotte, NC | IP-Enabled Service / VoIP | 140 | — | |
| 6119 | Level 3 Communications LLC - MD | Westminster, CO | Competitive Local Exchange Carrier | 139 | — | centurylink.com |
| 318J | Comcast IP Phone LLC | Philadelphia, PA | IP-Enabled Service / VoIP | 130 | — | comcast.com |
| 7529 | Teleport Communications America LLC - DC | Staten Island, NY | Competitive Local Exchange Carrier | 119 | — | att.com |
| 624H | Onvoy Spectrum LLC | Broomfield, CO | Wireless Carrier | 67 | — | |
| 281E | YMax Communications Corporation - MD | Palm Beach, FL | Competitive Local Exchange Carrier | 48 | — | ymaxcorp.com |
| 568G | Peerless Network of Maryland LLC | Chicago, IL | Competitive Local Exchange Carrier | 41 | — | peerlessnetwork.com |
| 7591 | Level 3 Telecom of Maryland LLC - MD | Columbia, MD | Competitive Local Exchange Carrier | 30 | — | centurylink.com |
| 8832 | Starpower Communications LLC - MD | Princeton, NJ | Competitive Local Exchange Carrier | 28 | — | astound.com |
| 321J | HD Carrier LLC | Henderson, NV | IP-Enabled Service / VoIP | 25 | — | hdcarrier.com |
| 508J | CenturyLink Communications LLC | Littleton, CO | IP-Enabled Service / VoIP | 23 | — | centurylink.com |
| 073H | Telnyx LLC | Chicago, IL | IP-Enabled Service / VoIP | 18 | — | telnyx.com |
| 7228 | MCImetro Access Transmission Services LLC - MD | Vienna, VA | Competitive Local Exchange Carrier | 17 | — | verizon.com |
| 8697 | Baltimore-Washington Telephone (BWT) | Laurel, MD | Competitive Local Exchange Carrier | 17 | — | bwtel.com |
| 082H | Local Access LLC - MD | Windermere, FL | Competitive Local Exchange Carrier | 14 | — | |
| 4720 | USCOC of Cumberland Inc dba United States Cellular - MD | Chicago, IL | Wireless Carrier | 14 | — | uscellular.com |
| MULT | Multiple OCN Listing | Administrative / Reserved | 13 | — | ||
| 2593 | Core Communications Inc - MD | Annapolis, MD | Competitive Local Exchange Carrier | 9 | — | coretel.net |
| 4492 | VDL Inc dba Global Telecom Brokers - MD | Owings Mills, MD | Competitive Local Exchange Carrier | 9 | — | xtel.net |
| 6630 | Spok Inc | Plano, TX | Wireless Carrier | 9 | — | spok.com |
| 7325 | Teleport Communications America LLC - MD | Staten Island, NY | Competitive Local Exchange Carrier | 9 | — | att.com |
| 228C | IDT America Corporation - MD | Newark, NJ | Underlying Local Exchange Carrier | 8 | — | idt.net |
| 2596 | Quantum Telecommunications Inc - MD | Manchester, MD | Competitive Local Exchange Carrier | 8 | — | qis.net |
| 964H | Barr Tell USA Inc | Long Beach, NY | Competitive Local Exchange Carrier | 5 | — | barrtell.com |
| 197D | Vonage America LLC | Holmdel, NJ | IP-Enabled Service / VoIP | 4 | — | vonage.com |
| 551G | NUSO LLC | Atlanta, GA | Wireless Carrier | 4 | — | 365wireless.net |
| 425J | CSC Wireless LLC | Long Island City, NY | Wireless Carrier | 2 | — | alticeusa.com |
| 676A | Mountain Communications LLC dba Procom - MD | Bruceton Mills, WV | Competitive Local Exchange Carrier | 2 | — | 4-procom.com |
| 7421 | AT&T Local | Bedminster, NJ | Competitive Local Exchange Carrier | 2 | — | att.com |
| 836G | Shentel Communications LLC - MD | Edinburg, VA | Competitive Local Exchange Carrier | 2 | — | shentel.com |
| 3806 | Core Communications Inc - PA | Annapolis, MD | Competitive Local Exchange Carrier | 1 | — | coretel.net |
| 939H | Commio LLC | Austin, TX | IP-Enabled Service / VoIP | 1 | — | commio.com |
| 9748 | American Messaging Services LLC | Lewisville, TX | Wireless Carrier | 1 | — | americanmessaging.net |