Outbound Addresses

We use a variety of outbound network addresses. For our production services, we provide official outbound addresses that don’t change often. For the services that are still in development, we aim to keep the addresses static, but they may change more frequently.

We use the IP addresses documented here for public scanning, but they are shared across all our customers and public services as well. Please do not expose any additional ports to us. If you need to scan your private and restricted infrastructure, we will soon be able to provide private agents for this purpose.

Host Assessments

Our name-based (host) assessments originate from two sets of addresses, one associated with our primary egress point and the other with our backup location. For convenience, the hostname outbound.hardenize.com always resolves to these addresses:

$ host outbound.hardenize.com
outbound.hardenize.com has address 35.245.99.127
outbound.hardenize.com has address 172.99.67.55
outbound.hardenize.com has address 18.233.176.231
outbound.hardenize.com has address 45.79.154.188
outbound.hardenize.com has IPv6 address 2600:1f18:753:1b00:eb42:a50a:13c8:2f67
outbound.hardenize.com has IPv6 address 2001:4802:7805:104:be76:4eff:fe20:236
outbound.hardenize.com has IPv6 address 2600:3c03:0:0:f03c:93ff:fe85:e891

Network Scanning

We carry out our network scanning from the IP addresses specified below:

3.215.243.24
143.42.238.18
2600:1f18:753:1b05:e569:f3d6:e5bc:bf68
2600:3c03::f03c:93ff:fe21:7636

Distributed Monitoring

We carry out our distributed monitoring from a different set of IP addresses, as below:

13.56.124.57
155.138.192.10
157.175.30.135
18.176.23.254
18.229.233.196
3.11.222.162
3.126.141.39
45.77.74.225
54.251.147.231
54.66.138.173
2001:19f0:5401:1abc:0:0:0:1
2001:19f0:9002:2587:0:0:0:1
2406:da14:9b5:e200:8825:7f53:da05:92b8
2406:da18:deb:800:d6bb:b452:87d8:c348
2406:da1c:8f:9302:e669:a84:83cd:fc6c
2600:1f1c:2d3:6202:29f7:5366:e66c:a41c
2600:1f1e:fad:2c02:25fb:c746:8156:f6fe
2a05:d014:12a:2b02:4d33:c554:97d8:866a
2a05:d01c:5da:5802:409:4d39:75d:b724
2a05:d01e:c59:1901:6f81:c072:37f:7a8f

Integrations and zone transfers

Our integrations and zone transfers originate from the IP addresses specified below:

35.245.10.245
18.157.56.111