func expandCIDRInputValue(value string) []string {
	var ips []string
	ipsCh, _ := mapcidr.IPAddressesAsStream(value)
	for ip := range ipsCh {
		ips = append(ips, ip)
	}
	return ips
}

func expandASNInputValue(value string) []string {
	var ips []string
	cidrs, _ := asn.GetCIDRsForASNNum(value)
	for _, cidr := range cidrs {
		ips = append(ips, expandCIDRInputValue(cidr.String())...)
	}
	return ips
}

...
case asn.IsASN(exclude):
ips := expandASNInputValue(exclude)
options.Deny = append(options.Deny, ips...)
...