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+---
+c: Copyright (C) Daniel Stenberg, <daniel.se>, et al.
+SPDX-License-Identifier: curl
+Title: CURLOPT_FTPPORT
+Section: 3
+Source: libcurl
+See-also:
+  - CURLOPT_FTP_USE_EPRT (3)
+  - CURLOPT_FTP_USE_EPSV (3)
+---
+
+# NAME
+
+CURLOPT_FTPPORT - make FTP transfer active
+
+# SYNOPSIS
+
+~~~c
+#include <curl/curl.h>
+
+CURLcode curl_easy_setopt(CURL *handle, CURLOPT_FTPPORT, char *spec);
+~~~
+
+# DESCRIPTION
+
+Pass a pointer to a null-terminated string as parameter. It specifies that the
+FTP transfer should be made actively and the given string is used to get the
+IP address to use for the FTP PORT instruction.
+
+The PORT instruction tells the remote server to do a TCP connect to our
+specified IP address. The string may be a plain IP address, a hostname, a
+network interface name (under Unix) or just a '-' symbol to let the library
+use your system's default IP address. Default FTP operations are passive, and
+does not use the PORT command.
+
+The address can be followed by a ':' to specify a port, optionally followed by
+a '-' to specify a port range. If the port specified is 0, the operating
+system picks a free port. If a range is provided and all ports in the range
+are not available, libcurl reports CURLE_FTP_PORT_FAILED for the
+handle. Invalid port/range settings are ignored. IPv6 addresses followed by a
+port or port range have to be in brackets. IPv6 addresses without port/range
+specifier can be in brackets.
+
+Examples with specified ports:
+
+~~~c
+  eth0:0
+  192.168.1.2:32000-33000
+  curl.se:32123
+  [::1]:1234-4567
+~~~
+
+We strongly advise against specifying the address with a name, as it causes
+libcurl to do a blocking name resolve call to retrieve the IP address. That
+name resolve operation does **not** use DNS-over-HTTPS even if
+CURLOPT_DOH_URL(3) is set.
+
+Using anything else than "-" for this option should typically only be done if
+you have special knowledge and confirmation that it works.
+
+You disable PORT again and go back to using the passive version by setting
+this option to NULL.
+
+The application does not have to keep the string around after setting this
+option.
+
+# DEFAULT
+
+NULL
+
+# PROTOCOLS
+
+FTP
+
+# EXAMPLE
+
+~~~c
+int main(void)
+{
+  CURL *curl = curl_easy_init();
+  if(curl) {
+    CURLcode res;
+    curl_easy_setopt(curl, CURLOPT_URL,
+                     "ftp://example.com/old-server/file.txt");
+    curl_easy_setopt(curl, CURLOPT_FTPPORT, "-");
+    res = curl_easy_perform(curl);
+    curl_easy_cleanup(curl);
+  }
+}
+~~~
+
+# AVAILABILITY
+
+Port range support was added in 7.19.5
+
+# RETURN VALUE
+
+Returns CURLE_OK if the option is supported, CURLE_UNKNOWN_OPTION if not, or
+CURLE_OUT_OF_MEMORY if there was insufficient heap space.