diff --git a/README.md b/README.md
index 8d749dcc..d8b83529 100644
--- a/README.md
+++ b/README.md
@@ -356,6 +356,7 @@ You don't have to do anything manually!
 1. Futurehosting API (https://www.futurehosting.com)
 1. Rackspace Cloud DNS (https://www.rackspace.com)
 1. Online.net API (https://online.net/)
+1. UltraDNS API (https://portal.ultradns.com)
 
 And:
 
diff --git a/dnsapi/README.md b/dnsapi/README.md
index f022cab0..c5a80d78 100644
--- a/dnsapi/README.md
+++ b/dnsapi/README.md
@@ -1259,6 +1259,22 @@ acme.sh --issue --dns dns_online -d example.com -d www.example.com
 
 `ONLINE_API_KEY` will be saved in `~/.acme.sh/account.conf` and will be reused when needed.
 
+## 66. Use UltraDNS API
+
+Set your UltraDNS User name, and password
+```
+export ULTRA_USR="abcd"
+export ULTRA_PWD="efgh"
+```
+
+To issue a cert run:
+
+```
+acme.sh --issue --dns dns_ultra -d example.com -d www.example.com
+```
+
+`ULTRA_USR` and `ULTRA_PWD` will be saved in `~/.acme.sh/account.conf` and will be resued when needed.
+
 # Use custom API
 
 If your API is not supported yet, you can write your own DNS API.
diff --git a/dnsapi/dns_ultra.sh b/dnsapi/dns_ultra.sh
new file mode 100644
index 00000000..e0a67a9a
--- /dev/null
+++ b/dnsapi/dns_ultra.sh
@@ -0,0 +1,165 @@
+#!/usr/bin/env sh
+
+# 
+# ULTRA_USR="your_user_goes_here"
+# 
+# ULTRA_PWD="some_password_goes_here"
+
+ULTRA_API="https://restapi.ultradns.com/v2/"
+
+#Usage: add _acme-challenge.www.domain.com "some_long_string_of_characters_go_here_from_lets_encrypt"
+dns_ultra_add(){
+  fulldomain=$1
+  txtvalue=$2
+  export txtvalue
+  ULTRA_USR="${ULTRA_USR:-$(_readaccountconf_mutable ULTRA_USR)}"
+  ULTRA_PWD="${ULTRA_PWD:-$(_readaccountconf_mutable ULTRA_PWD)}"
+  if [ -z "$ULTRA_USR" ] || [ -z "$ULTRA_PWD" ]; then
+  	ULTRA_USR=""
+  	ULTRA_PWD=""
+  	  _err "You didn't specify an UltraDNS username and password yet"
+  	  return 1
+  fi
+  # save the username and password to the account conf file.
+  _saveaccountconf_mutable ULTRA_USR "$ULTRA_USR"
+  _saveaccountconf_mutable ULTRA_PWD "$ULTRA_PWD"
+  _debug "First detect the root zone"
+  if ! _get_root "${fulldomain}"; then
+  	_err "invalid domain"
+  	return 1
+  fi
+  _debug _domain_id "${_domain_id}"
+  _debug _sub_domain "${_sub_domain}"
+  _debug _domain "${_domain}"
+  _debug "Getting txt records"
+  _ultra_rest GET "zones/${_domain_id}/rrsets/TXT?q=value:${fulldomain}"
+  if printf "%s" "$response" | grep \"totalCount\" >/dev/null; then
+ 	_err "Error, it would appear that this record already exists. Please review existing TXT records for this domain."
+  	return 1
+  fi
+
+  _info "Adding record"
+  if _ultra_rest POST "zones/$_domain_id/rrsets/TXT/${_sub_domain}" '{"ttl":300,"rdata":["'"${txtvalue}"'"]}'; then
+    if _contains "$response" "Successful"; then
+      _info "Added, OK"
+      return 0
+    elif _contains "$response" "Resource Record of type 16 with these attributes already exists"; then
+      _info "Already exists, OK"
+      return 0
+    else
+      _err "Add txt record error."
+      return 1
+    fi
+  fi
+  _err "Add txt record error."
+
+}
+
+dns_ultra_rm(){
+  fulldomain=$1
+  txtvalue=$2
+  export txtvalue
+  ULTRA_USR="${ULTRA_USR:-$(_readaccountconf_mutable ULTRA_USR)}"
+  ULTRA_PWD="${ULTRA_PWD:-$(_readaccountconf_mutable ULTRA_PWD)}"
+  if [ -z "$ULTRA_USR" ] || [ -z "$ULTRA_PWD" ]; then
+    ULTRA_USR=""
+    ULTRA_PWD=""
+      _err "You didn't specify an UltraDNS username and password yet"
+      return 1
+  fi
+
+  _debug "First detect the root zone"
+  if ! _get_root "${fulldomain}"; then
+    _err "invalid domain"
+    return 1
+  fi
+  _debug _domain_id "${_domain_id}"
+  _debug _sub_domain "${_sub_domain}"
+  _debug _domain "${domain}"
+
+  _debug "Getting TXT records"
+  _ultra_rest GET "zones/${_domain_id}/rrsets?q=kind:RECORDS+owner:${_sub_domain}"
+
+  if ! printf "%s" "$response" | grep \"resultInfo\" > /dev/null; then
+    _err "There was an error in obtaining the resource records for ${_domain_id}"
+    return 1
+  fi
+
+  count=$(printf "%s\n" "$response" | _egrep_o "\"returnedCount\":[^,]*" | cut -d: -f2 | cut -d'}' -f1)
+  _debug count "${count}"
+  if [ "${count}" -eq "" ]; then
+    _info "Text record is not present, will not delete anything."
+  else
+    if ! _ultra_rest DELETE "zones/$_domain_id/rrsets/TXT/${_sub_domain}" '{"ttl":300,"rdata":["'"${txtvalue}"'"]}'; then
+      _err "Deleting the record did not succeed, please verify/check."
+      return 1
+    fi
+    _contains "$response" ""
+  fi
+
+}
+
+####################  Private functions below ##################################
+#_acme-challenge.www.domain.com
+#returns
+# _sub_domain=_acme-challenge.www
+# _domain=domain.com
+# _domain_id=sdjkglgdfewsdfg
+_get_root(){
+	domain=$1
+	i=2
+	p=1
+	while true; do
+		h=$(printf "%s" "$domain" | cut -d . -f $i-100)
+		_debug h "$h"
+    _debug response "$response"
+		if [ -z "$h" ]; then
+			#not valid
+			return 1
+		fi
+		if ! _ultra_rest GET "zones"; then
+			return 1
+		fi
+		if _contains "${response}" "${h}." > /dev/null; then
+			_domain_id=$(echo "$response" | _egrep_o "${h}")
+			if [ "$_domain_id" ]; then
+				_sub_domain=$(printf "%s" "$domain" | cut -d . -f 1-$p)
+				_domain="${h}"
+        _debug sub_domain "${_sub_domain}"
+        _debug domain "${_domain}"
+				return 0
+			fi
+			return 1
+		fi
+		p=$i
+		i=$(_math "$i" + 1)
+	done
+	return 1
+}
+
+_ultra_rest(){
+  m=$1
+  ep="$2"
+  data="$3"
+  _debug "$ep"
+  _debug TOKEN "${AUTH_TOKEN}"
+
+  _ultra_login
+  export _H1="Content-Type: application/json"
+  export _H2="Authorization: Bearer ${AUTH_TOKEN}"
+
+  if [ "$m" != "GET" ]; then
+  	_debug data "${data}"
+    response="$(_post "${data}" "${ULTRA_API}"/"${ep}" "" "${m}")"
+  else
+    response="$(_get ${data} ${ULTRA_API}/${ep})"
+  fi
+}
+
+_ultra_login(){
+  AUTH_TOKEN=$(curl -X POST --data \
+  "grant_type=password&username=${ULTRA_USR}&password=${ULTRA_PWD}"\
+   "${ULTRA_API}authorization/token" | cut -d, -f3 | cut -d\" -f4)
+  export AUTH_TOKEN
+}
+