0000907303-04-000136 S-8 4 20040604 20040604 F5 NETWORKS INC 0001048695 7373 911714307 WA 0930 S-8 33 333-116187 04849973 401 ELLIOT AVE WEST STE 500 SEATTLE WA 98119 2062725555 401 ELLIOT AVE WEST STE 500 SEATTLE WA 98119 F5 LABS INC 19990305 S-8 1 forms8june2004.txt EX-5.1 2 exh51forms8june2004.txt EX-10.1 3 exh101toforms8june2004.txt EX-23.1 4 exh231toforms8june2004.txt