| Business | Phone |
| 3 Com 10440 Little Patuxent Pkwy, Columbia 21044 | (410) 992-6990 |
| Cisco Systems Inc 8865 Stanford Blvd # 201, Columbia 21045 | (410) 309-4800 |
| Dynanet Corp 10500 Little Patuxent Pkwy, Columbia 21044 | (410) 715-3775 |
| Enterasys Networks Inc 7160 Columbia Gateway Dr # 201, Columbia 21046 | (410) 312-3194 |
| Info Systems Inc 7164 Columbia Gateway Dr # 200, Columbia 21046 | (410) 312-0888 |
| Netadyne Networks Inc 8970 Route 108, Columbia 21045 | (410) 884-9336 |
| Nsc Llc 8840 Stanford Blvd, Columbia 21045 | (410) 872-9202 |
| Sourcefire Inc 7095 Samuel Morse Dr, Columbia 21046 | (410) 290-0024 |