use variable and set to icanhazip.com because ifconfig.co doesn't seem to be great

he-ddns

@@ -8,6 +8,7 @@ die() {
 
 url="https://dyn.dns.he.net/nic/update"
 config="/usr/local/etc/he-ddnsrc"
+ip_host="icanhazip.com"
 
 help_text="Usage: $0 [OPTIONS]
 Update Hurricane Electric Dynamic DNS for domains in the configuration file
@@ -49,7 +50,7 @@ done
 # shellcheck source=he-ddnsrc
 . "$config" || die $LINENO
 
-ipv4="$(curl -sSL4 https://ifconfig.co/ip)" || die $LINENO
+ipv4="$(curl -sSL4 "$ip_host")" || die $LINENO
 for domain in "${!DOMAINS4[@]}"; do
 	printf "%s :: " "$domain"
 	key=${DOMAINS4[$domain]}
@@ -57,7 +58,7 @@ for domain in "${!DOMAINS4[@]}"; do
 	echo
 done
 
-ipv6="$(curl -sSL6 https://ifconfig.co/ip)" || die $LINENO
+ipv6="$(curl -sSL6 "$ip_host")" || die $LINENO
 for domain in "${!DOMAINS6[@]}"; do
 	printf "%s :: " "$domain"
 	key=${DOMAINS6[$domain]}