Network and security

Inbound IPs

IP address ranges to which clients can send their HTTPS requests to Számlázz.hu (effective from August 1, 2025):

• 173.245.48.0/20
• 103.21.244.0/22
• 103.22.200.0/22
• 103.31.4.0/22
• 141.101.64.0/18
• 108.162.192.0/18
• 190.93.240.0/20
• 188.114.96.0/20
• 197.234.240.0/22
• 198.41.128.0/17
• 162.158.0.0/15
• 104.16.0.0/13
• 104.24.0.0/14
• 172.64.0.0/13
• 131.0.72.0/22

Outbound IPs

These are the fixed IP addresses from which Számlázz.hu calls its partners (data sent by us arrives from these addresses):

• 3.73.214.98
• 3.76.149.232
• 18.153.156.51

If you restrict access by IP (e.g. your system only accepts requests from certain addresses), whitelist these outbound IP addresses.

Next steps

1. Authentication: set up your Agent key
2. Sending requests: learn how to structure and send XML requests
3. Session cookies: understand how session handling works