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Barracuda Email Gateway Defense
formerly Email Security
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Email Gateway Defense IP Ranges Used for Configuration

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Follow these tips to ensure connectivity and redundancy:

  • Open your firewall ports to allow the below IP address ranges, based on your Barracuda Networks instance.
  • (Optional) Configure your mail server or router to block inbound email not originating from your Email Gateway Defense IP address ranges.
  • If you have a Barracuda Web Security Gateway or Barracuda Web Application Firewall, you might need to exempt ess.barracudanetworks.com from filtering.
  • Exempt traffic coming from Email Gateway Defense IP addresses from any kind of throttle or rate controls, RBL, and SPF or DKIM scanning.


Email Gateway Defense connects with your network from various IP addresses, including performing LDAP lookups. To ensure that the service can connect with your network, allow traffic originating from the range of network addresses based on your Barracuda Networks instance.

Important – Note that the IP addresses below are in CIDR notation and express a range of IP addresses. Be sure to use the entire range in your configurations, including the first and last IPs in the range.

Customers Using the Following Instances of Email Gateway Defense

Network Traffic to Email Gateway Defense (SMTP)Network Traffic from Email Gateway Defense (SMTP and other)
Australia (AU)3.24.133.128/253.24.133.128/25
Canada (CA)15.222.16.128/2515.222.16.128/25
Germany (DE)

35.157.190.224/27

18.185.115.192/26

18.184.203.224/27

35.157.190.224/27
United Kingdom (UK)

35.176.92.96/27

18.133.136.128/26

18.133.136.96/27

35.176.92.96/27
United States (US)

209.222.80.0/21

209.222.80.0/21

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