diff --git a/dnsapi/dns_sdns.sh b/dnsapi/dns_sdns.sh
new file mode 100644
index 00000000..cc244cfb
--- /dev/null
+++ b/dnsapi/dns_sdns.sh
@@ -0,0 +1,125 @@
+#!/usr/bin/env sh
+
+#  Usage to order a * certificate
+#  ./acme.sh --issue -d '*.www.domain.com'  --dns dns_sdns --server letsencrypt --dnssleep 240
+
+SDNS_API_URL="https://robot.s-dns.de:8488/"
+
+
+# export SDNS_ZONE_KEY=your_zone_key
+
+########  Public functions #####################
+
+# Adds a txt record with the specified value. Does not remove an existing record
+# Usage: dns_sdns_add  _acme-challenge.www.domain.com   "XKrxpRBosdIKFzxW_CT3KLZNf6q0HG9i01zxXp5CPBs"
+dns_sdns_add ()
+{
+  fulldomain=$1;
+  txtvalue=$2;
+  _debug2 "dns_sdns_add() entered";
+  SDNS_ZONE_KEY="${SDNS_ZONE_KEY:-$(_readaccountconf_mutable SDNS_ZONE_KEY)}";
+  if [ -z "$SDNS_ZONE_KEY" ]; then
+    SDNS_ZONE_KEY="";
+    _err "You didn't specify your zone key yet. (export SDNS_ZONE_KEY=yourkey)";
+    return 1;
+  fi;
+  _saveaccountconf_mutable SDNS_ZONE_KEY "$SDNS_ZONE_KEY";
+  _debug "First detect the root zone";
+  if ! _get_root "$fulldomain"; then
+    _err "invalid domain";
+    return 1;
+  fi;
+  _debug _sub_domain "$_sub_domain";
+  _debug _domain "$_domain";
+  _payload="<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>
+<zoneRequest>
+  <zone name=\"$_domain\" action=\"ADDORUPDATERR\" ddnskey=\"$SDNS_ZONE_KEY\">
+    <rr host=\"$_sub_domain\" type=\"TXT\" value=\"$txtvalue\" keepExisting=\"true\"/>
+  </zone>
+</zoneRequest>";
+  _debug2 "$_payload";
+  response=$(_post "$_payload" "$SDNS_API_URL");
+  _debug2 "$response";
+  if _contains "$response" "status=\"OK\""; then
+    _debug "The TXT record has been added.";
+    return 0;
+  else
+    _err "The attempt to add the TXT record has failed.";
+    return 1;
+  fi
+}
+
+# Removes a txt record with the specified value. This function does not remove resource records with the same name but a different values.
+# Usage: dns_sdns_rm  _acme-challenge.www.domain.com   "XKrxpRBosdIKFzxW_CT3KLZNf6q0HG9i01zxXp5CPBs"
+dns_sdns_rm ()
+{
+  fulldomain=$1;
+  txtvalue=$2;
+  _debug2 "dns_sdns_rm() entered";
+  SDNS_ZONE_KEY="${SDNS_ZONE_KEY:-$(_readaccountconf_mutable SDNS_ZONE_KEY)}";
+  if [ -z "$SDNS_ZONE_KEY" ]; then
+    SDNS_ZONE_KEY="";
+    _err "You didn't specify your zone key yet. (export SDNS_ZONE_KEY=yourkey)";
+    return 1;
+  fi;
+  _saveaccountconf_mutable SDNS_ZONE_KEY "$SDNS_ZONE_KEY";
+  _debug "First detect the root zone";
+  if ! _get_root "$fulldomain"; then
+    _err "invalid domain";
+    return 1;
+  fi;
+  _debug _sub_domain "$_sub_domain";
+  _debug _domain "$_domain";
+  _payload="<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>
+<zoneRequest>
+  <zone name=\"$_domain\" action=\"DELRR\"  ddnskey=\"$SDNS_ZONE_KEY\">
+    <rr host=\"$_sub_domain\" type=\"TXT\" value=\"$txtvalue\" keepExisting=\"true\"/>
+  </zone>
+</zoneRequest>";
+  _debug $_payload;
+  response=$(_post "$_payload" "$SDNS_API_URL");
+  _debug $response;
+  if _contains "$response" "status=\"OK\""; then
+    _debug "The TXT record has been deleted.";
+    return 0;
+  else
+    _err "The attempt to delete the TXT record has failed.";
+    return 1;
+  fi
+}
+
+####################  Private functions below ##################################
+#_acme-challenge.www.domain.com
+#returns
+# _sub_domain=_acme-challenge.www
+# _domain=domain.com
+_get_root ()
+{
+  fulldomain=$1;
+  _debug2 "_get_root() entered";
+  SDNS_ZONE_KEY="${SDNS_ZONE_KEY:-$(_readaccountconf_mutable SDNS_ZONE_KEY)}";
+  if [ -z "$SDNS_ZONE_KEY" ]; then
+    SDNS_ZONE_KEY="";
+    _err "You didn't specify your zone key yet. (export SDNS_ZONE_KEY=yourkey)";
+    return 1;
+  fi;
+  _saveaccountconf_mutable SDNS_ZONE_KEY "$SDNS_ZONE_KEY";
+  _payload="<?xml version=\"1.0\" encoding=\"ISO-8859-1\"?>
+<zoneRequest action=\"getRootZone\" ddnskey=\"$SDNS_ZONE_KEY\">
+  <hostname>$fulldomain</hostname>
+</zoneRequest>";
+  _debug2 "$_payload";
+  response=$(_post "$_payload" "$SDNS_API_URL");
+  _debug2 "$response";
+  if _contains "$response" "status=\"found\""; then
+    _debug "root domain is found";
+
+    _domain=$(printf "%s\n" "$response" | _egrep_o  "<zonename>(.*)</zonename>" | cut -d ">" -f 2 | cut -d "<" -f 1);
+    _sub_domain=$(printf "%s\n" "$response" | _egrep_o  "<hostname>(.*)</hostname>" | cut -d ">" -f 2 | cut -d "<" -f 1);
+
+    _debug _domain "$_domain";
+    _debug _sub_domain "$_sub_domain";
+    return 0;
+  fi
+}
+