diff --git a/common.php b/common.php
new file mode 100644
index 0000000..a236a54
--- /dev/null
+++ b/common.php
@@ -0,0 +1,46 @@
+<?php
+
+$namePtn    = "[a-zA-Z_][\w-]*";
+$ipPtn      = "\d+\.\d+\.\d+\.\d+";
+$macPtn     = "[\da-f]{2}(?:[:-][\da-f]{2}){5}";
+$domainPtn  = "[\w-]+(\.[\w-]+)*";
+$ifacePtn   = "[\w,]+";
+$modesPtn   = "static|proxy|ra-only|slaac|ra-names|ra-stateless|ra-advrouter|off-link";
+$timePtn    = "\d+[mhds]";
+$commentPtn = "[ \t]*(?:# ?(?<comment>.*))?";
+
+$long_mask = [
+    0b00000000000000000000000000000000,
+    0b10000000000000000000000000000000,
+    0b11000000000000000000000000000000,
+    0b11100000000000000000000000000000,
+    0b11110000000000000000000000000000,
+    0b11111000000000000000000000000000,
+    0b11111100000000000000000000000000,
+    0b11111110000000000000000000000000,
+    0b11111111000000000000000000000000,
+    0b11111111100000000000000000000000,
+    0b11111111110000000000000000000000,
+    0b11111111111000000000000000000000,
+    0b11111111111100000000000000000000,
+    0b11111111111110000000000000000000,
+    0b11111111111111000000000000000000,
+    0b11111111111111100000000000000000,
+    0b11111111111111110000000000000000,
+    0b11111111111111111000000000000000,
+    0b11111111111111111100000000000000,
+    0b11111111111111111110000000000000,
+    0b11111111111111111111000000000000,
+    0b11111111111111111111100000000000,
+    0b11111111111111111111110000000000,
+    0b11111111111111111111111000000000,
+    0b11111111111111111111111100000000,
+    0b11111111111111111111111110000000,
+    0b11111111111111111111111111000000,
+    0b11111111111111111111111111100000,
+    0b11111111111111111111111111110000,
+    0b11111111111111111111111111111000,
+    0b11111111111111111111111111111100,
+    0b11111111111111111111111111111110,
+    0b11111111111111111111111111111111,
+];
diff --git a/load-conf.php b/load-conf.php
index 797b249..0989f11 100644
--- a/load-conf.php
+++ b/load-conf.php
@@ -1,4 +1,5 @@
 <?php
+require_once "common.php";
 
 $conf_paths = [
     "/etc/dnsmasq.d/ipam.conf",
@@ -17,13 +18,4 @@ foreach($conf_paths as $path) {
         $conf = array_merge($default, parse_ini_file($path, true, INI_SCANNER_TYPED));
         break;
     }
-}
-
-$namePtn    = "[a-zA-Z_][\w-]*";
-$ipPtn      = "\d+\.\d+\.\d+\.\d+";
-$macPtn     = "[\da-f]{2}(?:[:-][\da-f]{2}){5}";
-$domainPtn  = "[\w-]+(\.[\w-]+)*";
-$ifacePtn   = "[\w,]+";
-$modesPtn   = "static|proxya-only|slaac|ra-names|ra-stateless|ra-advrouter|off-link";
-$timePtn    = "\d+[mhds]";
-$commentPtn = "[ \t]*(?:# ?(?<comment>.*))?";
+}
\ No newline at end of file
diff --git a/load-networks.php b/load-networks.php
deleted file mode 100644
index 7bc6a21..0000000
--- a/load-networks.php
+++ /dev/null
@@ -1,78 +0,0 @@
-<?php
-
-require_once "load-conf.php";
-
-$networks = [];
-if (isset($conf["dhcp-optsfile"]) && file_exists($conf["dhcp-optsfile"])) {
-    foreach(file($conf["dhcp-optsfile"]) as $line) {
-        if (preg_match(
-            "/^(?:tag:(?<tag>$namePtn),)?option:(?<option>$namePtn),(?<value>[^#\r\n]*)$commentPtn$/",
-            $line, $option
-        )) {
-            if (!isset($networks[$option["tag"] ?? "default"])) $networks[$option["tag"] ?? "default"] = [];
-            $networks[$option["tag"] ?? "default"][$option["option"]] = $option["value"];
-        }
-    }
-}
-
-if (isset($conf["conf-file"]) && file_exists($conf["conf-file"])) {
-    foreach(file($conf["conf-file"]) as $line) {
-        if (preg_match(
-            "/^dhcp-range=(?:(?:tag|set):(?<tag>$namePtn),)?(?<start_addr>$ipPtn),(?:(?<end_addr>$ipPtn)|$modesPtn)(?:,(?<netmask>$ipPtn)(?:,$ipPtn)?)?(?:,(?<lease_time>$timePtn|infinite))?$commentPtn$/",
-            $line, $range, PREG_UNMATCHED_AS_NULL
-        )) {
-            if (!isset($networks[$range["tag"] ?? "default"])) $networks[$range["tag"] ?? "default"] = [];
-            $networks[$range["tag"] ?? "default"]["dhcp-range"] = [
-                "start_addr" => $range["start_addr"],
-                "end_addr"   => $range["end_addr"],
-                "netmask"    => $range["netmask"],
-                "lease_time" => $range["lease_time"],
-            ];
-        }
-    }
-}
-
-$long_mask = [
-    0b00000000000000000000000000000000,
-    0b10000000000000000000000000000000,
-    0b11000000000000000000000000000000,
-    0b11100000000000000000000000000000,
-    0b11110000000000000000000000000000,
-    0b11111000000000000000000000000000,
-    0b11111100000000000000000000000000,
-    0b11111110000000000000000000000000,
-    0b11111111000000000000000000000000,
-    0b11111111100000000000000000000000,
-    0b11111111110000000000000000000000,
-    0b11111111111000000000000000000000,
-    0b11111111111100000000000000000000,
-    0b11111111111110000000000000000000,
-    0b11111111111111000000000000000000,
-    0b11111111111111100000000000000000,
-    0b11111111111111110000000000000000,
-    0b11111111111111111000000000000000,
-    0b11111111111111111100000000000000,
-    0b11111111111111111110000000000000,
-    0b11111111111111111111000000000000,
-    0b11111111111111111111100000000000,
-    0b11111111111111111111110000000000,
-    0b11111111111111111111111000000000,
-    0b11111111111111111111111100000000,
-    0b11111111111111111111111110000000,
-    0b11111111111111111111111111000000,
-    0b11111111111111111111111111100000,
-    0b11111111111111111111111111110000,
-    0b11111111111111111111111111111000,
-    0b11111111111111111111111111111100,
-    0b11111111111111111111111111111110,
-    0b11111111111111111111111111111111,
-];
-
-foreach ($networks as $tag => &$options) {
-    $ip_addr  = ip2long($network["router"]  ?? $options["dhcp-range"]["start_addr"]);
-    $netmask  = ip2long($network["netmask"] ?? $options["dhcp-range"]["netmask"]);
-    $hostmask = 0xFFFFFFFF & ~$netmask;
-    $options["network-addr"] = $ip_addr & $netmask;
-    $options["broadcast"]    = $ip_addr | $hostmask;
-    $options["cidr_mask"]    = array_search($netmask, $long_mask);
-}
\ No newline at end of file
diff --git a/load-options.php b/load-options.php
new file mode 100644
index 0000000..8c093a3
--- /dev/null
+++ b/load-options.php
@@ -0,0 +1,17 @@
+<?php
+require_once "common.php";
+require_once "load-conf.php";
+
+$options = [];
+if (isset($conf["dhcp-optsfile"]) && file_exists($conf["dhcp-optsfile"])) {
+    foreach(file($conf["dhcp-optsfile"]) as $line) {
+        if (preg_match(
+            "/^(?:tag:(?<tag>$namePtn),)?option:(?<option>$namePtn),(?<value>[^#\r\n]*)$commentPtn$/",
+            $line, $option
+        )) {
+            if (!isset($option["tag"])) $option["tag"] = "default";
+            if (!isset($options[$option["tag"]])) $options[$option["tag"]] = [];
+            $options[$option["tag"]][$option["option"]] = $option["value"];
+        }
+    }
+}
\ No newline at end of file
diff --git a/load-ranges.php b/load-ranges.php
new file mode 100644
index 0000000..570048b
--- /dev/null
+++ b/load-ranges.php
@@ -0,0 +1,22 @@
+<?php
+require_once "common.php";
+require_once "load-conf.php";
+
+$ranges = [];
+if (isset($conf["conf-file"]) && file_exists($conf["conf-file"])) {
+    foreach(file($conf["conf-file"]) as $line) {
+        if (preg_match(
+            "/^dhcp-range=(?:(?:tag|set):(?<tag>$namePtn),)?(?<start_addr>$ipPtn),(?:(?<end_addr>$ipPtn)|$modesPtn)(?:,(?<netmask>$ipPtn)(?:,$ipPtn)?)?(?:,(?<lease_time>$timePtn|infinite))?$commentPtn$/",
+            $line, $range, PREG_UNMATCHED_AS_NULL
+        )) {
+            if (!isset($range["tag"])) $range["tag"] = "default";
+            if (!isset($ranges[$range["tag"]])) $ranges[$range["tag"]] = [];
+            $ranges[$range["tag"]]["dhcp-range"] = [
+                "start-addr" => $range["start_addr"],
+                "end-addr"   => $range["end_addr"],
+                "netmask"    => $range["netmask"],
+                "lease_time" => $range["lease_time"],
+            ];
+        }
+    }
+}
\ No newline at end of file
diff --git a/network-options.php b/network-options.php
new file mode 100644
index 0000000..abd7316
--- /dev/null
+++ b/network-options.php
@@ -0,0 +1,129 @@
+<?php
+require_once "common.php";
+
+if (preg_match("/^$namePtn$/", $_SERVER["QUERY_STRING"])) {
+    include_once "load-options.php";
+    include_once "load-ranges.php";
+
+    $tag    = $_SERVER["QUERY_STRING"];
+    $option = $options[$tag];
+    $range  = $ranges[$tag];
+} else {
+    $tag     = "";
+    $option  = [];
+    $range   = [];
+}
+
+$placeholder = [];
+if (preg_match(
+    "/\n\d+: (?P<iface>[a-z0-9]+)    inet (?<ipaddr>$ipPtn)\/(?<cidr_mask>\d+) brd (?<broadcast>$ipPtn)/",
+    `ip -o -4 a`,
+    $this_server
+)) {
+    $placeholder["netmask"] = long2ip($long_mask[(int)$this_server["cidr_mask"]]);
+}
+if (preg_match(
+    "/default via ($ipPtn)/",
+    `ip -4 route`,
+    $router
+)) {
+    $placeholder["router"] = $router[1];
+}
+$placeholder["dns-server"] = $_SERVER['SERVER_ADDR'];
+
+preg_match_all("/\d+ (?<name>$namePtn)/", `dnsmasq --help dhcp`, $option_names, PREG_SET_ORDER);
+?>
+<!DOCTYPE html>
+<html lang="fr">
+    <head>
+        <meta charset="UTF-8">
+        <meta name="viewport" content="width=device-width, initial-scale=1.0">
+        <title>IPAM</title>
+        <script src="https://cdn.jsdelivr.net/npm/jquery@3.7.1/dist/jquery.min.js"></script>
+        <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/fomantic-ui@2.9.4/dist/semantic.min.css">
+        <script src="https://cdn.jsdelivr.net/npm/fomantic-ui@2.9.4/dist/semantic.min.js"></script>
+        <link rel="stylesheet" href="style.css">
+    </head>
+    <body>
+        <nav class="ui inverted teal menu">
+            <a class="header item" href=".">IP<em>AM</em></a>
+        </nav>
+        <main class="ui text container">
+            <h1>Éditer un réseau</h1>
+            <form action="update-network.php" method="post" class="ui form">
+                <input type="hidden" name="previous-tag" value="<?=$tag?>"/>
+                <div class="field">
+                    <label for="tag" class="required">Nom</label>
+                    <input id="tag" name="tag" type="text" pattern="[a-zA-Z_][\w\-]*" placeholder="Reseau-local" required value="<?=$tag?>"
+                    title="une lettre suivie par des lettres, des chiffres ou des tirets"/>
+                </div>
+                <h4 class="ui header">Paramètres</h4>
+                <div id="optionsDiv" class="three fields" style="flex-wrap: wrap">
+<?php foreach(array_merge($option, $placeholder) as $name => $value) : ?>
+                    <div class="field">
+                        <label for="<?=$name?>"><?=$name?></label>
+                        <input id="<?=$name?>" name="<?=$name?>" type="text"
+                            <?=isset($option[$name]) ? "value='{$option[$name]}'": ""?>
+                            <?=isset($placeholder[$name]) ? "placeholder='{$placeholder[$name]}'": ""?>
+                            <?=($name == "netmask") || ($name == "router") || (strpos($name, "server") !== false) ? 'pattern="^(?:(?:25[0-5]|2[0-4][0-9]|1?[0-9]{1,2})\.){3}(?:25[0-5]|2[0-4][0-9]|1?[0-9]{1,2})$"' : "" ?>
+                        />
+                    </div>
+<?php endforeach; ?>
+                </div>
+                <div class="field">
+                    <label for="addOptionSelect">Ajouter un paramètre</label>
+                    <select id="addOptionSelect" class="ui search selection dropdown">
+<?php foreach ($option_names as $option) :?>
+                        <option value="<?=$option["name"]?>"><?=$option["name"]?></option>
+<?php endforeach; ?>
+                    </select>
+                    <script>
+addOptionSelect.oninput = function(event) {
+    var name = addOptionSelect.value
+    var field = document.createElement("div")
+    field.className = "field"
+    var label = document.createElement("label")
+    label.setAttribute("for", name)
+    label.textContent = name
+    field.appendChild(label)
+    var input = document.createElement("input")
+    input.setAttribute("id", name)
+    input.setAttribute("name", name)
+    input.setAttribute("type", "text")
+    if (name == "netmask" || name == "router" || name.includes("server")) {
+        input.setAttribute("pattern", "^(?:(?:25[0-5]|2[0-4][0-9]|1?[0-9]{1,2})\.){3}(?:25[0-5]|2[0-4][0-9]|1?[0-9]{1,2})$")
+    }
+    field.appendChild(input)
+    optionsDiv.appendChild(field)
+}
+                    </script>
+                </div>
+                <h4 class="ui header">Plage DHCP dynamique</h4>
+                <div class="two fields">
+                    <div class="field">
+                        <label for="start-addr">Première adresse</label>
+                        <div class="ui labeled input">
+                            <input id="start-addr" name="start-addr" type="text" title="xxx.xxx.xxx.xxx"
+                                pattern="(?:(?:25[0-5]|2[0-4]\d|1\d{2}|[1-9]?\d)\.){3}(?:25[0-5]|2[0-4]\d|1\d{2}|[1-9]?\d)"
+                                placeholder="192.168.1.100"
+                                value="<?=$range["start-addr"] ?? "" ?>"/>
+                        </div>
+                    </div>
+                    <div class="field">
+                        <label for="end-addr">Dernière adresse ou mode</label>
+                        <select id="end-addr" name="end-addr" class="ui search dropdown">
+<?php if (isset($range["end-addr"])): ?>
+                            <option value="<?=$range["end-addr"]?>"><?=$range["end-addr"]?></option>
+<?php endif; ?>
+                            <option value="">Adresse IP</option>
+                            <option value="static">static</option>
+                            <option value="proxya-only">proxy</option>
+                        </select>
+                        <script>$('#end-addr').dropdown({allowAdditions: true})</script>
+                    </div>
+                </div>
+                <button type="submit" class="ui button">Enregistrer</button>
+            </form>
+        </main>
+    </body>
+</html>