diff --git a/dnsapi/dns_ionos.sh b/dnsapi/dns_ionos.sh
new file mode 100755
index 00000000..e6bd5000
--- /dev/null
+++ b/dnsapi/dns_ionos.sh
@@ -0,0 +1,184 @@
+#!/usr/bin/env sh
+
+# Supports IONOS DNS API Beta v1.0.0
+#
+# Usage:
+#   Export IONOS_PREFIX and IONOS_SECRET before calling acme.sh:
+#
+#   $ export IONOS_PREFIX="..."
+#   $ export IONOS_SECRET="..."
+#
+#   $ acme.sh --issue --dns dns_ionos ...
+
+IONOS_API="https://api.hosting.ionos.com/dns"
+IONOS_ROUTE_ZONES="/v1/zones"
+
+IONOS_TXT_TTL=60 # minimum accepted by API
+IONOS_TXT_PRIO=10
+
+dns_ionos_add() {
+  fulldomain=$1
+  txtvalue=$2
+
+  if ! _ionos_init; then
+    return 1
+  fi
+
+  _new_record="{\"name\":\"$_sub_domain.$_domain\",\"type\":\"TXT\",\"content\":\"$txtvalue\",\"ttl\":$IONOS_TXT_TTL,\"prio\":$IONOS_TXT_PRIO,\"disabled\":false}"
+
+  # As no POST route is supported by the API, check for existing records and include them in the PATCH request in order not delete them.
+  # This is required to support ACME v2 wildcard certificate creation, where two TXT records for the same domain name are created.
+
+  _ionos_get_existing_records "$fulldomain" "$_zone_id"
+
+  if [ "$_existing_records" ]; then
+    _body="[$_new_record,$_existing_records]"
+  else
+    _body="[$_new_record]"
+  fi
+
+  if _ionos_rest PATCH "$IONOS_ROUTE_ZONES/$_zone_id" "$_body" && [ -z "$response" ]; then
+    _info "TXT record has been created successfully."
+    return 0
+  fi
+
+  return 1
+}
+
+dns_ionos_rm() {
+  fulldomain=$1
+  txtvalue=$2
+
+  if ! _ionos_init; then
+    return 1
+  fi
+
+  if ! _ionos_get_record "$fulldomain" "$_zone_id" "$txtvalue"; then
+    _err "Could not find _acme-challenge TXT record."
+    return 1
+  fi
+
+  if _ionos_rest DELETE "$IONOS_ROUTE_ZONES/$_zone_id/records/$_record_id" && [ -z "$response" ]; then
+    _info "TXT record has been deleted successfully."
+    return 0
+  fi
+
+  return 1
+}
+
+_ionos_init() {
+  IONOS_PREFIX="${IONOS_PREFIX:-$(_readaccountconf_mutable IONOS_PREFIX)}"
+  IONOS_SECRET="${IONOS_SECRET:-$(_readaccountconf_mutable IONOS_SECRET)}"
+
+  if [ -z "$IONOS_PREFIX" ] || [ -z "$IONOS_SECRET" ]; then
+    _err "You didn't specify an IONOS api prefix and secret yet."
+    _err "Read https://beta.developer.hosting.ionos.de/docs/getstarted to learn how to get a prefix and secret."
+    _err ""
+    _err "Then set them before calling acme.sh:"
+    _err "\$ export IONOS_PREFIX=\"...\""
+    _err "\$ export IONOS_SECRET=\"...\""
+    _err "\$ acme.sh --issue -d ... --dns dns_ionos"
+    return 1
+  fi
+
+  _saveaccountconf_mutable IONOS_PREFIX "$IONOS_PREFIX"
+  _saveaccountconf_mutable IONOS_SECRET "$IONOS_SECRET"
+
+  if ! _get_root "$fulldomain"; then
+    _err "Cannot find this domain in your IONOS account."
+    return 1
+  fi
+}
+
+_get_root() {
+  domain=$1
+  i=1
+  p=1
+
+  if _ionos_rest GET "$IONOS_ROUTE_ZONES"; then
+    response="$(echo "$response" | tr -d "\n")"
+
+    while true; do
+      h=$(printf "%s" "$domain" | cut -d . -f $i-100)
+      if [ -z "$h" ]; then
+        return 1
+      fi
+
+      _zone="$(echo "$response" | _egrep_o "\"name\":\"$h\".*\}")"
+      if [ "$_zone" ]; then
+        _zone_id=$(printf "%s\n" "$_zone" | _egrep_o "\"id\":\"[a-fA-F0-9\-]*\"" | _head_n 1 | cut -d : -f 2 | tr -d '\"')
+        if [ "$_zone_id" ]; then
+          _sub_domain=$(printf "%s" "$domain" | cut -d . -f 1-$p)
+          _domain=$h
+
+          return 0
+        fi
+
+        return 1
+      fi
+
+      p=$i
+      i=$(_math "$i" + 1)
+    done
+  fi
+
+  return 1
+}
+
+_ionos_get_existing_records() {
+  fulldomain=$1
+  zone_id=$2
+
+  if _ionos_rest GET "$IONOS_ROUTE_ZONES/$zone_id?recordName=$fulldomain&recordType=TXT"; then
+    response="$(echo "$response" | tr -d "\n")"
+
+    _existing_records="$(printf "%s\n" "$response" | _egrep_o "\"records\":\[.*\]" | _head_n 1 | cut -d '[' -f 2 | sed 's/]//')"
+  fi
+}
+
+_ionos_get_record() {
+  fulldomain=$1
+  zone_id=$2
+  txtrecord=$3
+
+  if _ionos_rest GET "$IONOS_ROUTE_ZONES/$zone_id?recordName=$fulldomain&recordType=TXT"; then
+    response="$(echo "$response" | tr -d "\n")"
+
+    _record="$(echo "$response" | _egrep_o "\"name\":\"$fulldomain\"[^\}]*\"type\":\"TXT\"[^\}]*\"content\":\"\\\\\"$txtrecord\\\\\"\".*\}")"
+    if [ "$_record" ]; then
+      _record_id=$(printf "%s\n" "$_record" | _egrep_o "\"id\":\"[a-fA-F0-9\-]*\"" | _head_n 1 | cut -d : -f 2 | tr -d '\"')
+
+      return 0
+    fi
+  fi
+
+  return 1
+}
+
+_ionos_rest() {
+  method="$1"
+  route="$2"
+  data="$3"
+
+  IONOS_API_KEY="$(printf "%s.%s" "$IONOS_PREFIX" "$IONOS_SECRET")"
+
+  export _H1="X-API-Key: $IONOS_API_KEY"
+
+  if [ "$method" != "GET" ]; then
+    export _H2="Accept: application/json"
+    export _H3="Content-Type: application/json"
+
+    response="$(_post "$data" "$IONOS_API$route" "" "$method")"
+  else
+    export _H2="Accept: */*"
+
+    response="$(_get "$IONOS_API$route")"
+  fi
+
+  if [ "$?" != "0" ]; then
+    _err "Error $route"
+    return 1
+  fi
+
+  return 0
+}