EXHIBIT 21 LENFEST COMMUNICATIONS, INC. SUBSIDIARIES 1. CAH, INC. (Formerly Cable AdNet, Inc. as of 11/25/91) Pennsylvania Corporation 2. CAM Systems, Inc. Delaware Corporation 3. LenComm, Inc. California Corporation Fictitious Names Bay Cablevision 4. Lenfest Advertising, Inc. (d/b/a "Radius Communications") Delaware Corporation Fictitious Names Radius Communications 5. Lenfest Atlantic, Inc. New Jersey Corporation Fictitious Names Suburban Cable TV Co. Inc. 6. Lenfest Australia, Inc. Delaware Corporation 7. Lenfest Bay Area, Inc. Delaware Corporation 8. Lenfest Clearview, Inc. Delaware Corporation 9. Lenfest International, Inc. Delaware Corporation 10. Lenfest Jersey, Inc. Delaware Corporation 11. Lenfest New Castle County, Inc. Delaware Corporation 12. Lenfest Oaks, Inc. Pennsylvania Corporation 13. Lenfest Philadelphia Interconnect, Inc. Delaware Corporation Fictitious Names The Philadelphia Interconnect 1 14. Lenfest Programming Services, Inc. Pennsylvania Corporation 15. Lenfest Raystay Holdings, Inc. Delaware Corporation 16. Lenfest - Smart Tone, Inc. Delaware Corporation 17. Lenfest Telephony, Inc. Delaware Corporation Fictitious Names Suburban Telecommunications 18. Lenfest West, Inc. California Corporation Fictitious Names Cable Oakland 19. Lenfest York, Inc. Delaware Corporation 20. LenNet, Inc. Pennsylvania Corporation Fictitious Names MetroNet Communications (A joint venture) GlobeNet is a Partner 21. Lenfest MCN, Inc. (formerly MicroNet, Inc. and Garden State Micro Relay, Inc.) Delaware Corporation Fictitious Names Garden State Micro Relay (PA and NJ) 22. Lenfest Atlantic Communications, Inc. (formerly MicroNet Atlantic Communications, Inc. 12/30/97) Delaware Corporation 23. Lenfest MCN Delmarva, Inc. (formerly MicroNet Delmarva, Inc., 12/30/97) Delaware Corporation 24. Lenfest MCN Delmarva Investments, Inc. MicroNet Diversified Investments, Inc. Delaware Corporation 25. StarNet, Inc. Delaware Corporation 26. StarNet Development, Inc. Utah Corporation 2 27. StarNet Interactive Entertainment, Inc. Delaware Corporation 28. Suburban Cable TV Co. Inc. Pennsylvania Corporation Fictitious Names Bridge Cable Suburban Cable of Lancaster County Suburban Cable of Chester County 29. Suburban Connect, Inc. Delaware Corporation 30. TeleStar Marketing, Inc. Pennsylvania Corporation 31. Tri-State Media, Inc. Delaware Corporation 32. Cable AdCom Pennsylvania General Partnership 33. Clearview Partners Pennsylvania General Partnership 34. Garden State Cablevision, L. P. New Jersey Limited Partnership 35. GlobeNet Pennsylvania General Partnership 36. L-TCI Delaware General Partnership 37. Lenfest New Castle County Delaware General Partnership Fictitious Names Suburban Cable TV 38. MetroNet Pennsylvania Joint Venture 39. Lenfest MCN Delmarva Associates, L.P. effective December 30, 1997 (formerly MicroNet Delmarva Associates, L.P.) Delaware Limited Partnership 40. StarNet/CEA II Partners Delaware General Partnership 3