cURL: Selecting a custom DNS server to resolve domain names

curl_custom_dns.sh

#!/usr/bin/env bash

# this can be useful when developing against a custom DNS server, or 
# for example, if you made a change to the DNS settings of a domain, and you 
# know the authoritative nameserver IP address for a domain, you could use this 
# to bypass the intermediate DNS cache, and apply an HTTP request using the new 
# DNS settings supplied by your specified (authoritative) nameserver

curl --dns-servers <DNSIP,DNSIP> url.com

# acquire the authoritative nameserver IP using

dig url.com NS

# then ping the NS to get its IP address

# you can also directly resolve

curl \
  --resolve www.example.com:443:198.14.3.5 \
  https://www.example.com \
  --verbose

MacPorts

thanks @patrick-webs