function revdns() {
octets=""
addr="in-addr.arpa"

# split the IP address into an array of octets
IFS="." read -r -a octets <<< "$1"

# add each octet to our $addr string in reverse order
for octet in "${octets[@]}"; do
addr=$octet"."$addr
done

# run a DNS pointer lookup with dig
# `+short` makes dig's output very terse (un-verbose)
# `"${@:2}"` passes any extra params from this command to dig
dig ptr +short $addr "${@:2}"
}
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