CIDR blocks
Classless Inter-Domain Routing (CIDR) blocks are ranges of addresses. IBM Cloud® Activity Tracker traffic will be sent from these addresses. This traffic includes webhooks, archiving to IBM Cloud Object Storage, streaming to Event Streams and
so on. You can use these CIDR blocks in firewalls and other configurations to ensure that the data received by your code, or another IBM service, originates only from IBM Cloud Activity Tracker.
As of 28 March 2024 the IBM Log Analysis and IBM Cloud Activity Tracker services are deprecated and will no longer be supported as of 30 March 2025. Customers will need to migrate to IBM Cloud Logs, which replaces these two services, prior to
30 March 2025.
The CIDR blocks with a date next to them indicates the date they will be available. The CIDR blocks indicated as Deprecated are no longer supported and should be removed from any configured allowlists.
Public CIDR blocks
Chennai
Table 1. Chennai public CIDR blocks
| Region |
CIDR block |
| Chennai |
169.38.96.224/28 |
| Chennai |
169.38.126.192/27 9 March 2023 |
Frankfurt
Table 2. Frankfurt public CIDR blocks
| Region |
CIDR block |
| Frankfurt |
161.156.114.96/28 |
| Frankfurt |
158.177.213.0/25 |
| Frankfurt |
158.177.168.32/28 Deprecated |
| Frankfurt |
149.81.103.80/28 Deprecated |
| Frankfurt |
158.177.37.192/26 |
| Frankfurt |
158.177.76.160/27 |
| Frankfurt |
149.81.189.192/26 |
| Frankfurt |
161.156.36.64/27 |
| Frankfurt |
161.156.36.128/26 |
| Frankfurt |
149.81.190.96/27 |
| Frankfurt |
161.156.41.0/25 |
| Frankfurt |
149.81.197.0/25 |
London
Table 3. London public CIDR blocks
| Region |
CIDR block |
| London |
158.176.89.32/27 |
| London |
158.176.143.48/28 Deprecated |
| London |
141.125.139.160/27 |
| London |
141.125.139.144/28 |
| London |
158.175.167.48/28 |
| London |
158.175.168.32/27 |
| London |
158.176.67.64/26 5 April 2023 |
| London |
161.156.205.0/26 5 April 2023 |
| London |
141.125.144.192/26 5 April 2023 |
Madrid
Table 4. Madrid public CIDR blocks
| Region |
CIDR block |
| Madrid |
13.120.68.144/28 26 September 2023 |
| Madrid |
13.122.68.112/28 26 September 2023 |
| Madrid |
13.121.68.64/28 26 September 2023 |
Osaka
Table 5. Osaka public CIDR blocks
| Region |
CIDR block |
| Osaka |
163.73.65.176/28 |
| Osaka |
163.68.73.240/28 |
| Osaka |
163.69.68.48/28 |
| Osaka |
163.69.72.96/27 3 April 2023 |
| Osaka |
163.73.72.0/27 3 April 2023 |
| Osaka |
163.68.68.160/27 3 April 2023 |
Sao Paulo
Table 6. Sao Paulo public CIDR blocks
| Region |
CIDR block |
| Brazil |
169.57.222.224/28 |
| Brazil |
163.107.65.208/28 |
| Brazil |
163.109.67.224/28 |
| Brazil |
169.57.178.32/27 9 March 2023 |
| Brazil |
163.109.74.0/27 9 March 2023 |
| Brazil |
163.107.74.32/27 9 March 2023 |
Sydney
Table 7. Sydney public CIDR blocks
| Region |
CIDR block |
| Sydney |
168.1.40.48/28 |
| Sydney |
130.198.92.144/28 |
| Sydney |
135.90.90.240/28 |
| Sydney |
168.1.31.192/27 3 April 2023 |
| Sydney |
130.198.83.0/27 3 April 2023 |
| Sydney |
135.90.82.32/27 3 April 2023 |
Tokyo
Table 8. Tokyo public CIDR blocks
| Region |
CIDR block |
| Tokyo |
161.202.78.80/28 |
| Tokyo |
161.202.78.192/27 |
| Tokyo |
128.168.83.96/27 |
| Tokyo |
165.192.97.208/28 |
| Tokyo |
128.168.95.64/28 |
| Tokyo |
165.192.107.32/27 |
US East
Table 9. US-East public CIDR blocks
| Region |
CIDR block |
| US-East |
169.60.83.144/28 |
| US-East |
169.60.120.32/27 |
| US-East |
52.117.81.128/26 |
| US-East |
169.47.54.16/28 |
| US-East |
52.117.100.16/28 |
| US-East |
169.62.40.192/27 |
| US-East |
169.47.188.0/27 |
| US-East |
169.59.154.128/26 |
| US-East |
150.239.98.0/26 |
US South
Table 10. US-South public CIDR blocks
| Region |
CIDR block |
| US-South |
67.228.81.0/27 |
| US-South |
67.228.228.128/26 |
| US-South |
67.228.231.0/25 |
| US-South |
169.61.184.64/28 |
| US-South |
169.63.192.0/25 |
| US-South |
169.63.193.0/26 |
| US-South |
67.228.222.64/28 |
| US-South |
169.48.177.128/28 |
| US-South |
52.118.43.0/27 |
| US-South |
52.116.251.64/27 |
| US-South |
169.59.254.192/26 |
| US-South |
169.59.255.128/25 |
Private CIDR blocks
Chennai
Table 11. Chennai private CIDR blocks
| Region |
CIDR block |
| Chennai |
10.162.140.0/26 |
Frankfurt
Table 12. Frankfurt private CIDR blocks
| Region |
CIDR block |
| Frankfurt |
10.194.10.64/26 |
| Frankfurt |
10.240.29.64/26 |
| Frankfurt |
10.13.13.128/26 |
| Frankfurt |
10.240.239.0/24 |
| Frankfurt |
10.215.253.128/25 |
| Frankfurt |
10.21.3.0/25 |
| Frankfurt |
10.13.86.128/25 |
| Frankfurt |
10.20.6.0/24 |
| Frankfurt |
10.13.100.0/24 |
London
Table 13. London private CIDR blocks
| Region |
CIDR block |
| London |
10.72.11.64/26 |
| London |
10.196.113.0/25 9 March 2023 |
| London |
10.196.134.64/26 |
| London |
10.242.25.128/25 9 March 2023 |
| London |
10.222.46.128/26 |
| London |
10.222.86.128/25 9 March 2023 |
Madrid
Table 14. Madrid public CIDR blocks
| Region |
CIDR block |
| Madrid |
10.118.14.192/26 26 September 2023 |
| Madrid |
10.118.76.192/26 26 September 2023 |
| Madrid |
10.118.142.128/26 26 September 2023 |
Osaka
Table 15. Osaka private CIDR blocks
| Region |
CIDR block |
| Osaka |
10.10.8.64/26 |
| Osaka |
10.9.15.128/26 |
| Osaka |
10.8.30.64/26 |
Sao Paulo
Table 16. Sao Paulo private CIDR blocks
| Region |
CIDR block |
| Brazil |
10.150.186.192/26 |
| Brazil |
10.14.9.64/26 |
| Brazil |
10.15.20.192/26 |
Sydney
Table 17. Sydney private CIDR blocks
| Region |
CIDR block |
| Sydney |
10.139.31.0/26 |
| Sydney |
10.63.207.128/26 |
| Sydney |
10.195.95.64/26 |
Tokyo
Table 18. Tokyo private CIDR blocks
| Region |
CIDR block |
| Tokyo |
10.129.65.128/26 |
| Tokyo |
10.192.21.128/26 |
| Tokyo |
10.193.77.192/26 |
| Tokyo |
10.193.30.0/25 6 April 2023 |
| Tokyo |
10.133.200.128/25 6 April 2023 |
| Tokyo |
10.192.170.128/25 6 April 2023 |
Toronto
Table 19. Toronto private CIDR blocks
| Region |
CIDR block |
| Toronto |
10.114.152.128/26 |
| Toronto |
10.11.16.64/26 |
| Toronto |
10.243.35.128/26 |
| Toronto |
10.115.99.128/25 10 May 2023 |
| Toronto |
10.11.18.128/25 10 May 2023 |
| Toronto |
10.243.52.128/25 10 May 2023 |
US South
Table 20. US-South private CIDR blocks
| Region |
CIDR block |
| US-South |
10.93.88.0/26 |
| US-South |
10.241.27.0/26 |
| US-South |
10.5.108.0/24 |
| US-South |
10.37.71.0/26 |
| US-South |
10.5.193.0/25 |
| US-South |
10.37.81.0/25 |
| US-South |
10.241.199.0/25 |
| US-South |
10.37.88.0/24 |
| US-South |
10.241.202.0/24 |
US East
Table 21. US-East private CIDR blocks
| Region |
CIDR block |
| US-East |
10.183.182.128/26 |
| US-East |
10.190.43.128/25 |
| US-East |
10.191.225.64/26 |
| US-East |
10.188.240.192/26 |
| US-East |
10.183.242.128/25 |
| US-East |
10.189.123.128/25 |