TIL -AWS has a nice api endpoint to get its ip ranges.

Not only you can query by service but also you can get notification of any changes to ip ranges by subscribing to SNS AmazonIpSpaceChanged. source

To get ec2 service ip ranges

>> curl -s https://ip-ranges.amazonaws.com/ip-ranges.json | jq -r '.prefixes[] | select(.service=="EC2") | .ip_prefix'

To select services in us-east-1 and us-west-2. This type of filtering might come handy when a service provider who runs on AWS specifically mentions which regions they run their service on ie circleci

>> curl -s https://ip-ranges.amazonaws.com/ip-ranges.json | jq -r '.prefixes[] | select(select(.region=="us-east-1" or .region=="us-east-2" or .region=="us-west-1") and .service=="EC2") | .ip_prefix'
18.208.0.0/13
52.95.245.0/24
54.196.0.0/15
216.182.224.0/21
52.119.224.0/21
216.182.232.0/22
52.144.193.128/26
107.20.0.0/14
52.94.224.0/20
67.202.0.0/18
52.95.0.0/20
205.251.246.0/24
52.93.249.0/24
207.171.160.0/20
184.73.0.0/16
54.80.0.0/13
.
.
.

54.172.0.0/15

>>> curl -s https://ip-ranges.amazonaws.com/ip-ranges.json | jq -r '.prefixes[] | select(select(.region=="us-east-1" or .region=="us-east-2" or .region=="us-west-1" ) and .service=="EC2") | .ip_prefix+ " " +.region' ' 
18.208.0.0/13 us-east-1
52.95.245.0/24 us-east-1
54.196.0.0/15 us-east-1
54.241.0.0/16 us-west-1
184.169.128.0/17 us-west-1
216.182.224.0/21 us-east-1
216.182.232.0/22 us-east-1
54.193.0.0/16 us-west-1
107.20.0.0/14 us-east-1
67.202.0.0/18 us-east-1
184.73.0.0/16 us-east-1
54.80.0.0/13 us-east-1
.
.
.
54.172.0.0/15 us-east-1