CESNET-CERTS is the official name of the CESNET Computer Security Incident Response Team since January 2004. The team consists of employees of CESNET Association. CESNET-CERTS headquarters are located in Zikova 4, Prague, Czech Republic.


Our constituency covers the CESNET2 network, i.e, all IP addresses within the AS2852 autonomous system. The CESNET-CERTS team is fully responsible for handling and responding to security incidents in domains cesnet.cz, cesnet2.cz, ces.net, liberouter.org, liberouter.net, ipv6.cz, eduroam.cz, and in the CESNET2 internal infrastructure marked as INFRA-AW in the RIPE database.

Contact information

  • Phone number: +420 2 2435 2994
  • Timezone: CET (GMT+0100 in winter, GMT+0200 in summer)
  • E-mail address: certs@cesnet.cz
  • We use following PGP key:
    • User ID: CESNET-CERTS <certs@cesnet.cz>
    • Key ID: 0x9CAA8579
    • Key type: DH/DSS
    • Key size: 1024 bits
    • Expiration: never
    • Fingerprint: 341D 3EB0 0160 941F 6A06 4401 F9BF C741 9CAA 8579

Contacting us

The preferred method to contact CESNET-CERTS team is to send an e-mail to the address certs@cesnet.cz. In case you need to send us confidential information, please, use our PGP public key to encrypt the message.

Reporting security incidents

To report an incident of network abuse to CESNET-CERTS please follow these guidelines.

Our goals

  • Providing a single, trusted point of contact for the CESNET2 network.
  • Coordinating the handling of security incidents which originated in the CESNET2 network, as well as preventing such incidents.
  • Helping the CESNET2 members and customers to improve their computer and network security.
Last modified: 27.01.2016 12:57