Network

IPs and Domains for Whitelisting

To ensure optimal performance and uninterrupted access to our services, it is critical that you whitelist the following IP addresses and domain names in your firewall or security appliances. Whitelisting our trusted network resources will prevent any issues related to email filtering, network connectivity, or application performance.

Our IPs and domains are essential for maintaining secure communication between your infrastructure and our services. Below, you will find the technical details for the required IPs and domains, categorized by service.

Datacenter IP Range:

Block

IPv4: 192.41.84.194/26

Range

IPv4: 192.41.84.194 - 192.41.84.254

Additional IPs

IPv4: 172.181.50.33

Staging:IPv4: 4.236.57.132

Specific IPs for External Services:

SendGrid (Email Delivery):

159.183.139.139

Domains for Whitelisting

To ensure uninterrupted communication with our servers and services, whitelist the following domains at the DNS level:

• cbtravel.com
• cbtat.com
• andavo.com
• goct.com
• christophersontravel.com

Ports and Protocols

For proper communication, please ensure the following ports are open:

• HTTP: Port 80 (TCP)
• HTTPS: Port 443 (TCP)
• SMTP (Email): Port 25, 587 (for unencrypted/TLS connections), 465 (for SSL connections)

Security Recommendations

We recommend updating your firewall configurations to allow outbound traffic to these IPs and domains. Additionally, ensure that any Intrusion Detection Systems (IDS) or Intrusion Prevention Systems (IPS) are configured to trust our traffic to avoid any false-positive alerts that might block legitimate communications.

For customers using email filtering solutions, make sure the IP addresses for our email services, such as those related to SendGrid, are added to your email security provider’s safelist. This will ensure the timely delivery of critical communication.