Additional Listing

Spirent PLC
4 June 2001

Spirent plc


Application has been made to The UK Listing Authority and the
London Stock Exchange for block listings totalling 512,500
Ordinary shares of 3 1/3p each to trade on the London Stock
Exchange and to be admitted to the Official List upon
issuance. The shares shall rank pari passu with the existing
issued shares of the Company.

The Block listings consist of 435,000 shares to be issued
under the Spirent Employee Stock Purchase Plan and 77,500
shares to be issued under the Net-Hopper Amended Free Stated
Share Plan.

Copies of this announcement are available from the office of
Cazenove & Co. Ltd for the period of 2 business days from the
date hereof.