I did this

export http_proxy=myproxy
export no_proxy=.domain1,.domain2,127.0.0.1,10.0.0.0/8,172.16.0.0/12,192.168.0.0/16
curl http://10.10.20.1

and curl go to the proxy...

I expected the following

i expect that curl no go to the proxy because 10.10.20.1 are in cidr 10.0.0.0/8...

curl/libcurl version

all version

operating system

all system unix (i've not tested windows)

when i read in the curl code i found you make only str match:
https://github.com/curl/curl/blob/master/lib/url.c#L2322