The following TSA service providers were publicly available on the Internet at the time of writing. Ascertia makes no representations on their continued availability, accuracy of the URLs or accuracy/trustworthiness of time information they provide. The information is provided only for testing purposes:

hostname:port, IP_address:port or URL

Protocol

TSA Web Page

http://www.ascertia.com/adss/tsa

HTTP (POST)

N/A

tsp.test.polito.it:8318

Pure TCP (RFC3161)

http://security.polito.it

tsa.cryptoapps.com:3318

Pure TCP (RFC3161)

N/A

testtsa.actalis.it:318

Pure TCP (RFC3161)

N/A

tsp.iaik.at:318
tsp.iaik.at:10318
http://tsp.iaik.at/tsp/TspRequest Port: 80
https://tsp.iaik.at/tsp/TspRequest Port: 443

Pure TCP
TLS
HTTP
HTTPS 

http://tsp.iaik.at