CIDR blocks
Classless Inter-Domain Routing (CIDR) blocks are ranges of addresses. IBM® Log Analysis 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 Log Analysis.
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. For information about IBM Cloud Logs, see the IBM Cloud Logs documentation.
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
Chennai public CIDR blocks
| Region |
CIDR block |
| Chennai |
169.38.96.224/28 |
| Chennai |
169.38.126.192/27 9 March 2023 |
Frankfurt
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
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
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
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
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
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
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 |
Toronto
Toronto public CIDR blocks
| Region |
CIDR block |
| Toronto |
169.53.180.32/28 |
| Toronto |
169.55.136.192/27 9 March 2023 |
| Toronto |
163.74.69.208/28 Deprecated |
| Toronto |
163.75.69.160/28 |
| Toronto |
163.74.71.224/27 9 March 2023 |
| Toronto |
163.75.75.128/27 9 March 2023 |
US East
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
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
Chennai private CIDR blocks
| Region |
CIDR block |
| Chennai |
10.162.140.0/26 |
Frankfurt
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
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
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
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
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
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
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
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
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
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 |