SSL Labs Known Issues & SSL Labs IP Source IP Addresses

Document created by Ivan Ristić on Jun 17, 2014Last modified by Robert Dell'Immagine on May 1, 2020
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This page documents the known issues with the SSL Labs code running in production (i.e.,


If your issue is listed as fixed in the latest development version, check it at:


Report SSL Labs issues.


IP Addresses

We are using the following IP address ranges:

  • SSL Labs - (IPv4) & 2600:C02:1020:4202::/64 (IPv6)
  • SSL Pulse -
  • Development SSL Labs server - (IPv4) & 2001:4801:7827:102:93a4:e8aa:5bca:d1f (IPv6)



At present, SSL Labs has the following limitations:

  • SSL Labs currently uses Mozilla CA certificate store only. If the root is not there we report it as not trusted. A future SSL Labs version will report trust for each major root store separately.
  • Certificate trust is not checked in handshake simulation, we only perform TLS handshake.