diff --git a/dnsapi/dns_constellix.sh b/dnsapi/dns_constellix.sh
new file mode 100644
index 0000000..c47ede4
--- /dev/null
+++ b/dnsapi/dns_constellix.sh
@@ -0,0 +1,141 @@
+#!/usr/bin/env sh
+
+# Author: Wout Decre <wout@canodus.be>
+
+CONSTELLIX_Api="https://api.dns.constellix.com/v1"
+#CONSTELLIX_Key="XXX"
+#CONSTELLIX_Secret="XXX"
+
+########  Public functions #####################
+
+# Usage: add  _acme-challenge.www.domain.com   "XKrxpRBosdIKFzxW_CT3KLZNf6q0HG9i01zxXp5CPBs"
+# Used to add txt record
+dns_constellix_add() {
+  fulldomain=$1
+  txtvalue=$2
+
+  CONSTELLIX_Key="${CONSTELLIX_Key:-$(_readaccountconf_mutable CONSTELLIX_Key)}"
+  CONSTELLIX_Secret="${CONSTELLIX_Secret:-$(_readaccountconf_mutable CONSTELLIX_Secret)}"
+
+  if [ -z "$CONSTELLIX_Key" ] || [ -z "$CONSTELLIX_Secret" ]; then
+    _err "You did not specify the Contellix API key and secret yet."
+    return 1
+  fi
+
+  _saveaccountconf_mutable CONSTELLIX_Key "$CONSTELLIX_Key"
+  _saveaccountconf_mutable CONSTELLIX_Secret "$CONSTELLIX_Secret"
+
+  if ! _get_root "$fulldomain"; then
+    _err "Invalid domain"
+    return 1
+  fi
+
+  _info "Adding TXT record"
+  if _constellix_rest POST "domains/${_domain_id}/records" "[{\"type\":\"txt\",\"add\":true,\"set\":{\"name\":\"${_sub_domain}\",\"ttl\":120,\"roundRobin\":[{\"value\":\"${txtvalue}\"}]}}]"; then
+    if printf -- "%s" "$response" | grep "{\"success\":\"1 record(s) added, 0 record(s) updated, 0 record(s) deleted\"}" >/dev/null; then
+      _info "Added"
+      return 0
+    else
+      _err "Error adding TXT record"
+      return 1
+    fi
+  fi
+}
+
+# Usage: fulldomain txtvalue
+# Used to remove the txt record after validation
+dns_constellix_rm() {
+  fulldomain=$1
+  txtvalue=$2
+
+  CONSTELLIX_Key="${CONSTELLIX_Key:-$(_readaccountconf_mutable CONSTELLIX_Key)}"
+  CONSTELLIX_Secret="${CONSTELLIX_Secret:-$(_readaccountconf_mutable CONSTELLIX_Secret)}"
+
+  if [ -z "$CONSTELLIX_Key" ] || [ -z "$CONSTELLIX_Secret" ]; then
+    _err "You did not specify the Contellix API key and secret yet."
+    return 1
+  fi
+
+  if ! _get_root "$fulldomain"; then
+    _err "Invalid domain"
+    return 1
+  fi
+
+  _info "Removing TXT record"
+  if _constellix_rest POST "domains/${_domain_id}/records" "[{\"type\":\"txt\",\"delete\":true,\"filter\":{\"field\":\"name\",\"op\":\"eq\",\"value\":\"${_sub_domain}\"}}]"; then
+    if printf -- "%s" "$response" | grep "{\"success\":\"0 record(s) added, 0 record(s) updated, 1 record(s) deleted\"}" >/dev/null; then
+      _info "Removed"
+      return 0
+    else
+      _err "Error removing TXT record"
+      return 1
+    fi
+  fi
+}
+
+####################  Private functions below ##################################
+
+_get_root() {
+  domain=$1
+  i=2
+  p=1
+  _debug "Detecting root zone"
+  while true; do
+    h=$(printf "%s" "$domain" | cut -d . -f $i-100)
+    if [ -z "$h" ]; then
+      return 1
+    fi
+
+    if ! _constellix_rest GET "domains"; then
+      return 1
+    fi
+
+    if _contains "$response" "\"name\":\"$h\""; then
+      _domain_id=$(printf "%s\n" "$response" | _egrep_o "\"id\":[^,]*" | head -n 1 | cut -d ':' -f 2 | tr -d '}')
+      if [ "$_domain_id" ]; then
+        _sub_domain=$(printf "%s" "$domain" | cut -d '.' -f 1-$p)
+        _domain="$h"
+
+        _debug _domain_id "$_domain_id"
+        _debug _sub_domain "$_sub_domain"
+        _debug _domain "$_domain"
+        return 0
+      fi
+      return 1
+    fi
+    p=$i
+    i=$(_math "$i" + 1)
+  done
+  return 1
+}
+
+_constellix_rest() {
+  m=$1
+  ep="$2"
+  data="$3"
+  _debug "$ep"
+
+  rdate=$(date +"%s")"000"
+  hmac=$(printf "%s" "$rdate" | _hmac sha1 "$(printf "%s" "$CONSTELLIX_Secret" | _hex_dump | tr -d ' ')" | _base64)
+
+  export _H1="x-cnsdns-apiKey: $CONSTELLIX_Key"
+  export _H2="x-cnsdns-requestDate: $rdate"
+  export _H3="x-cnsdns-hmac: $hmac"
+  export _H4="Accept: application/json"
+  export _H5="Content-Type: application/json"
+
+  if [ "$m" != "GET" ]; then
+    _debug data "$data"
+    response="$(_post "$data" "$CONSTELLIX_Api/$ep" "" "$m")"
+  else
+    response="$(_get "$CONSTELLIX_Api/$ep")"
+  fi
+
+  if [ "$?" != "0" ]; then
+    _err "Error $ep"
+    return 1
+  fi
+
+  _debug response "$response"
+  return 0
+}