diff --git a/README.md b/README.md
index 724f6eed..859e8fe3 100644
--- a/README.md
+++ b/README.md
@@ -261,6 +261,7 @@ You don't have to do anything manually!
 1. DNSMadeEasy.com API
 1. nsupdate API
 1. aliyun.com(阿里云) API
+1. ISPConfig 3.1 API
 
 **More APIs coming soon...**
 
diff --git a/dnsapi/README.md b/dnsapi/README.md
index ca9b08d9..dbd27fce 100644
--- a/dnsapi/README.md
+++ b/dnsapi/README.md
@@ -218,7 +218,29 @@ acme.sh --issue --dns dns_ali -d example.com -d www.example.com
 
 The `Ali_Key` and `Ali_Secret` will be saved in `~/.acme.sh/account.conf` and will be reused when needed.
 
-# 12. Use custom API
+## 12. Use ISPConfig 3.1 API
+
+This only works for ISPConfig 3.1 (and newer).
+
+Create a Remote User in the ISPConfig Control Panel. The Remote User must have access to at least `DNS zone functions` and `DNS txt functions`.
+
+```
+export ISPC_User="xxx"
+export ISPC_Password="xxx"
+export ISPC_Api="https://ispc.domain.tld:8080/remote/json.php"
+export ISPC_Api_Insecure=1
+```
+If you have installed ISPConfig on a different port, then alter the 8080 accordingly.
+Leaver ISPC_Api_Insecure set to 1 if you have not a valid ssl cert for your installation. Change it to 0 if you have a valid ssl cert.
+
+To issue a cert:
+```
+acme.sh --issue --dns dns_ispconfig -d example.com -d www.example.com
+```
+
+The `ISPC_User`, `ISPC_Password`, `ISPC_Api`and `ISPC_Api_Insecure` will be saved in `~/.acme.sh/account.conf` and will be reused when needed.
+
+# 13. Use custom API
 
 If your API is not supported yet, you can write your own DNS API.
 
@@ -235,6 +257,6 @@ acme.sh --issue --dns dns_myapi -d example.com -d www.example.com
 For more details, please check our sample script: [dns_myapi.sh](dns_myapi.sh)
 
 
-## 13. Use lexicon DNS API
+## 14. Use lexicon DNS API
 
 https://github.com/Neilpang/acme.sh/wiki/How-to-use-lexicon-dns-api
diff --git a/dnsapi/dns_ispconfig.sh b/dnsapi/dns_ispconfig.sh
new file mode 100755
index 00000000..eb55d356
--- /dev/null
+++ b/dnsapi/dns_ispconfig.sh
@@ -0,0 +1,158 @@
+#!/usr/bin/env sh
+
+# ISPConfig 3.1 API
+# User must provide login data and URL to the ISPConfig installation incl. port. The remote user in ISPConfig must have access to:
+# - DNS zone Functions
+# - DNS txt Functions
+
+# Report bugs to https://github.com/sjau/acme.sh
+
+# Values to export:
+# export ISPC_User="remoteUser"
+# export ISPC_Password="remotePasword"
+# export ISPC_Api="https://ispc.domain.tld:8080/remote/json.php"
+# export ISPC_Api_Insecure=1     # Set 1 for insecure and 0 for secure -> difference is whether ssl cert is checked for validity (0) or whether it is just accepted (1)
+
+########  Public functions #####################
+
+#Usage: dns_myapi_add   _acme-challenge.www.domain.com   "XKrxpRBosdIKFzxW_CT3KLZNf6q0HG9i01zxXp5CPBs"
+dns_ispconfig_add() {
+  fulldomain="${1}"
+  txtvalue="${2}"
+  _ISPC_credentials && _ISPC_login && _ISPC_getZoneInfo && _ISPC_addTxt
+}
+
+#Usage: dns_myapi_rm   _acme-challenge.www.domain.com
+dns_ispconfig_rm() {
+  fulldomain="${1}"
+  _ISPC_credentials && _ISPC_login && _ISPC_rmTxt
+}
+
+####################  Private functions bellow ##################################
+
+_ISPC_credentials() {
+  if [ -z "${ISPC_User}" ] || [ -z "$ISPC_Password" ] || [ -z "${ISPC_Api}" ] || [ -z "${ISPC_Api_Insecure}" ]; then
+    ISPC_User=""
+    ISPC_Password=""
+    ISPC_Api=""
+    ISPC_Api_Insecure=""
+    _err "You haven't specified the ISPConfig Login data, URL and whether you want check the ISPC SSL cert. Please try again."
+    return 1
+  else
+    _saveaccountconf ISPC_User "${ISPC_User}"
+    _saveaccountconf ISPC_Password "${ISPC_Password}"
+    _saveaccountconf ISPC_Api "${ISPC_Api}"
+    _saveaccountconf ISPC_Api_Insecure "${ISPC_Api_Insecure}"
+    # Set whether curl should use secure or insecure mode
+    HTTPS_INSECURE="${ISPC_Api_Insecure}"
+  fi
+}
+
+_ISPC_login() {
+  _info "Getting Session ID"
+  curData="{\"username\":\"${ISPC_User}\",\"password\":\"${ISPC_Password}\",\"client_login\":false}"
+  curResult="$(_post "${curData}" "${ISPC_Api}?login")"
+  if _contains "${curResult}" '"code":"ok"'; then
+    sessionID=$(echo "${curResult}" | _egrep_o "response.*" | cut -d ':' -f 2 | cut -d '"' -f 2)
+    _info "Retrieved Session ID."
+  else
+    _err "Couldn't retrieve the Session ID."
+    return 1
+  fi
+}
+
+_ISPC_getZoneInfo() {
+  _info "Getting Zoneinfo"
+  zoneEnd=false
+  curZone="${fulldomain}"
+  while [ "${zoneEnd}" = false ]; do
+    # we can strip the first part of the fulldomain, since it's just the _acme-challenge string
+    curZone="${curZone#*.}"
+    # suffix . needed for zone -> domain.tld.
+    curData="{\"session_id\":\"${sessionID}\",\"primary_id\":[{\"origin\":\"${curZone}.\"}]}"
+    curResult="$(_post "${curData}" "${ISPC_Api}?dns_zone_get")"
+    if _contains "${curResult}" '"id":"'; then
+      zoneFound=true
+      zoneEnd=true
+      _info "Retrieved zone data."
+    fi
+    if [ "${curZone#*.}" != "$curZone" ]; then
+      _debug2 "$curZone still contains a '.' - so we can check next higher level"
+    else
+      zoneEnd=true
+      _err "Couldn't retrieve zone data."
+      return 1
+    fi
+  done
+  if [ "${zoneFound}" ]; then
+    server_id=$(echo "${curResult}" | _egrep_o "server_id.*" | cut -d ':' -f 2 | cut -d '"' -f 2)
+    case "${server_id}" in
+      '' | *[!0-9]*)
+        _err "Server ID is not numeric."
+        return 1
+        ;;
+      *) _info "Retrieved Server ID" ;;
+    esac
+    zone=$(echo "${curResult}" | _egrep_o "\"id.*" | cut -d ':' -f 2 | cut -d '"' -f 2)
+    case "${zone}" in
+      '' | *[!0-9]*)
+        _err "Zone ID is not numeric."
+        return 1
+        ;;
+      *) _info "Retrieved Zone ID" ;;
+    esac
+    client_id=$(echo "${curResult}" | _egrep_o "sys_userid.*" | cut -d ':' -f 2 | cut -d '"' -f 2)
+    case "${client_id}" in
+      '' | *[!0-9]*)
+        _err "Client ID is not numeric."
+        return 1
+        ;;
+      *) _info "Retrieved Client ID." ;;
+    esac
+    zoneFound=""
+    zoneEnd=""
+  fi
+}
+
+_ISPC_addTxt() {
+  curSerial="$(date +%s)"
+  curStamp="$(date +'%F %T')"
+  params="\"server_id\":\"${server_id}\",\"zone\":\"${zone}\",\"name\":\"${fulldomain}.\",\"type\":\"txt\",\"data\":\"${txtvalue}\",\"aux\":\"0\",\"ttl\":\"3600\",\"active\":\"y\",\"stamp\":\"${curStamp}\",\"serial\":\"${curSerial}\""
+  curData="{\"session_id\":\"${sessionID}\",\"client_id\":\"${client_id}\",\"params\":{${params}}}"
+  curResult="$(_post "${curData}" "${ISPC_Api}?dns_txt_add")"
+  record_id=$(echo "${curResult}" | _egrep_o "\"response.*" | cut -d ':' -f 2 | cut -d '"' -f 2)
+  case "${record_id}" in
+    '' | *[!0-9]*)
+      _err "Couldn't add ACME Challenge TXT record to zone."
+      return 1
+      ;;
+    *) _info "Added ACME Challenge TXT record to zone." ;;
+  esac
+}
+
+_ISPC_rmTxt() {
+  # Need to get the record ID.
+  curData="{\"session_id\":\"${sessionID}\",\"primary_id\":{\"name\":\"${fulldomain}.\",\"type\":\"TXT\"}}"
+  curResult="$(_post "${curData}" "${ISPC_Api}?dns_txt_get")"
+  if _contains "${curResult}" '"code":"ok"'; then
+    record_id=$(echo "${curResult}" | _egrep_o "\"id.*" | cut -d ':' -f 2 | cut -d '"' -f 2)
+    case "${record_id}" in
+      '' | *[!0-9]*)
+        _err "Record ID is not numeric."
+        return 1
+        ;;
+      *)
+        unset IFS
+        _info "Retrieved Record ID."
+        curData="{\"session_id\":\"${sessionID}\",\"primary_id\":\"${record_id}\"}"
+        curResult="$(_post "${curData}" "${ISPC_Api}?dns_txt_delete")"
+        if _contains "${curResult}" '"code":"ok"'; then
+          _info "Removed ACME Challenge TXT record from zone."
+        else
+          _err "Couldn't remove ACME Challenge TXT record from zone."
+          return 1
+        fi
+        ;;
+    esac
+  fi
+}