diff --git a/he-ddns b/he-ddns
index c5a73a9..da40549 100755
--- a/he-ddns
+++ b/he-ddns
@@ -7,15 +7,14 @@ die() {
 }
 
 url="https://dyn.dns.he.net/nic/update"
+config="/usr/local/etc/he-ddnsrc"
 
-help_text="Usage: $0 [OPTIONS] DOMAIN KEYFILE
-Update Hurricane Electric Dynamic DNS for DOMAIN with key in KEYFILE.
-Requires curl to be installed in \$PATH.
+help_text="Usage: $0 [OPTIONS]
+Update Hurricane Electric Dynamic DNS for domains in the configuration file
+with associated keys. Requires curl to be installed in \$PATH.
 
 Options:
   -c, --config FILE     get configuration from FILE instead of $config
-  -4, --ipv4            use IPv4
-  -6, --ipv6            use IPv6
   -u, --url URL         update dns at URL instead of $url
   -h, --help            display this help
 
@@ -26,11 +25,6 @@ show_help() {
 	printf "%s" "$help_text"
 }
 
-args=
-ipv4=
-ipv6=
-config=/etc/he-ddnsrc
-
 while (($#)); do
 	case $1 in
 		-c|--config)
@@ -41,20 +35,6 @@ while (($#)); do
 				die $LINENO "$help_text"
 			fi
 			;;
-		-4|--ipv4)
-			ipv4=true
-			;;
-		-6|--ipv6)
-			ipv6=true
-			;;
-		-u|--url)
-			if [[ -n "$2" ]]; then
-				url="$2"
-				shift
-			else
-				die $LINENO "$help_text"
-			fi
-			;;
 		-h|--help)
 			show_help
 			exit
@@ -66,21 +46,21 @@ while (($#)); do
 	shift
 done
 
-domain="${args[1]}"
-key=$(<"${args[2]}") || die $LINENO
+# shellcheck source=he-ddnsrc
+. "$config" || die $LINENO
 
-if [[ "$ipv4" != "true" ]] && [[ "$ipv6" != "true" ]]; then
-	echo "Must specify either IPv4 or IPv6"
-fi
-
-if [[ "$ipv4" == "true" ]]; then
-	ip="$(curl -sSL4 https://ifconfig.co/ip)" || die $LINENO
-	curl -sSL4 "$url" -d "hostname=$domain" -d "password=$key" -d "myip=$ip" || die $LINENO
+ipv4="$(curl -sSL4 https://ifconfig.co/ip)" || die $LINENO
+for domain in "${!DOMAINS4[@]}"; do
+	printf "%s :: " "$domain"
+	key=${DOMAINS4[$domain]}
+	curl -sSL4 "$url" -d "hostname=$domain" -d "password=$key" -d "myip=$ipv4" || die $LINENO
 	echo
-fi
+done
 
-if [[ "$ipv6" == "true" ]]; then
-	ip="$(curl -sSL6 https://ifconfig.co/ip)" || die $LINENO
-	curl -sSL6 "$url" -d "hostname=$domain" -d "password=$key" -d "myip=$ip" || die $LINENO
+ipv6="$(curl -sSL6 https://ifconfig.co/ip)" || die $LINENO
+for domain in "${!DOMAINS6[@]}"; do
+	printf "%s :: " "$domain"
+	key=${DOMAINS6[$domain]}
+	curl -sSL6 "$url" -d "hostname=$domain" -d "password=$key" -d "myip=$ipv6" || die $LINENO
 	echo
-fi
+done