diff --git a/web/src/pages/AdminLinks.tsx b/web/src/pages/AdminLinks.tsx
index 9172929..57df684 100644
--- a/web/src/pages/AdminLinks.tsx
+++ b/web/src/pages/AdminLinks.tsx
@@ -1,9 +1,10 @@
 import { useEffect, useMemo, useState, type FormEvent } from "react";
 import { Link } from "react-router-dom";
-import { api, type AdminLink, type CurrentUser, type ServerRecord } from "../api/client";
+import { api, type AdminLink, type CurrentUser, type PortEntry, type ServerRecord } from "../api/client";
 import { useSortable } from "../hooks/useSortable";
 import SortableTh from "../components/SortableTh";
 import { downloadCsv } from "../utils/csv";
+import { guessAdminUrl, portOptionLabel } from "../utils/adminLinkUrl";
 
 interface LinkForm {
   serverId: number | "";
@@ -26,6 +27,11 @@ export default function AdminLinks({ user }: { user: CurrentUser }) {
   const [form, setForm] = useState<LinkForm>(emptyForm);
   const [saving, setSaving] = useState(false);
 
+  const [portOptions, setPortOptions] = useState<PortEntry[] | null>(null);
+  const [portAddress, setPortAddress] = useState<string | null>(null);
+  const [loadingPorts, setLoadingPorts] = useState(false);
+  const [portPick, setPortPick] = useState("");
+
   function load() {
     api.servers.allLinks()
       .then((res) => setLinks(res.links))
@@ -40,6 +46,37 @@ export default function AdminLinks({ user }: { user: CurrentUser }) {
       .catch(() => {});
   }, []);
 
+  // Once a server is picked in the add/edit form, offer to fill the URL from one of its own known
+  // ports (agent-reported or already noted on its Ports card) instead of typing it out by hand.
+  useEffect(() => {
+    setPortPick("");
+    if (form.serverId === "") {
+      setPortOptions(null);
+      setPortAddress(null);
+      return;
+    }
+    const serverId = form.serverId;
+    setLoadingPorts(true);
+    Promise.all([api.servers.detail(serverId), api.servers.ports.list(serverId)])
+      .then(([detail, portList]) => {
+        setPortAddress(detail.server.hostname || detail.ipAddresses[0] || null);
+        setPortOptions(portList.ports);
+      })
+      .catch(() => {
+        setPortOptions(null);
+        setPortAddress(null);
+      })
+      .finally(() => setLoadingPorts(false));
+  }, [form.serverId]);
+
+  function pickPort(key: string) {
+    setPortPick(key);
+    const entry = portOptions?.find((p) => `${p.protocol}:${p.port}` === key);
+    if (!entry) return;
+    const url = guessAdminUrl(portAddress, entry);
+    setForm((f) => ({ ...f, url: url ?? f.url, label: f.label || entry.label || entry.agent?.process || "" }));
+  }
+
   const filtered = useMemo(() => {
     if (!links) return [];
     const q = search.trim().toLowerCase();
@@ -166,6 +203,37 @@ export default function AdminLinks({ user }: { user: CurrentUser }) {
                   onChange={(e) => setForm({ ...form, url: e.target.value })}
                 />
               </div>
+              {form.serverId !== "" && (
+                <div className="col-12">
+                  <label className="form-label">Fill from a known port (optional)</label>
+                  <select
+                    className="form-select"
+                    style={{ maxWidth: 460 }}
+                    value={portPick}
+                    disabled={loadingPorts || !portOptions?.length}
+                    onChange={(e) => pickPort(e.target.value)}
+                  >
+                    <option value="">
+                      {loadingPorts
+                        ? "Loading this server's ports…"
+                        : portOptions?.length
+                          ? "— pick a port to fill in the URL above —"
+                          : "No known ports for this server yet"}
+                    </option>
+                    {portOptions?.map((p) => (
+                      <option key={`${p.protocol}:${p.port}`} value={`${p.protocol}:${p.port}`}>
+                        {portOptionLabel(p)}
+                      </option>
+                    ))}
+                  </select>
+                  {portOptions && portOptions.length > 0 && !portAddress && (
+                    <div className="form-hint">
+                      This server has no known hostname or IP yet, so picking a port won't fill in an address —
+                      see its Ports card under Infrastructure → Servers.
+                    </div>
+                  )}
+                </div>
+              )}
             </div>
             <div className="card-footer d-flex gap-2">
               <button type="submit" className="btn btn-primary" disabled={saving}>
diff --git a/web/src/pages/ServerDetail.tsx b/web/src/pages/ServerDetail.tsx
index f6bde4a..cd80079 100644
--- a/web/src/pages/ServerDetail.tsx
+++ b/web/src/pages/ServerDetail.tsx
@@ -5,6 +5,7 @@ import {
   type CurrentUser,
   type IntegrationSummary,
   type ManualTaskInput,
+  type PortEntry,
   type ProxmoxGuest,
   type ScheduleType,
   type ServerDetail as ServerDetailResponse,
@@ -15,6 +16,7 @@ import ServerPorts from "../components/ServerPorts";
 import ServerTags from "../components/ServerTags";
 import ServerTaskTable, { SCHEDULE_TYPE_LABELS } from "../components/ServerTaskTable";
 import { formatDateTime } from "../utils/date";
+import { guessAdminUrl, portOptionLabel } from "../utils/adminLinkUrl";
 
 const SCHEDULE_TYPE_OPTIONS: { value: ScheduleType; label: string }[] = Object.entries(SCHEDULE_TYPE_LABELS).map(
   ([value, label]) => ({ value: value as ScheduleType, label }),
@@ -111,6 +113,8 @@ export default function ServerDetail({ user }: { user: CurrentUser }) {
   const [editingAdminLinkId, setEditingAdminLinkId] = useState<number | null>(null);
   const [savingAdminLink, setSavingAdminLink] = useState(false);
   const [adminLinkError, setAdminLinkError] = useState<string | null>(null);
+  const [adminLinkPorts, setAdminLinkPorts] = useState<PortEntry[] | null>(null);
+  const [adminLinkPortPick, setAdminLinkPortPick] = useState("");
 
   const loadDetail = useCallback(() => {
     setRefreshing(true);
@@ -263,22 +267,46 @@ export default function ServerDetail({ user }: { user: CurrentUser }) {
     }
   }
 
+  function loadAdminLinkPorts() {
+    setAdminLinkPortPick("");
+    api.servers.ports
+      .list(serverId)
+      .then((res) => setAdminLinkPorts(res.ports))
+      .catch(() => setAdminLinkPorts(null));
+  }
+
   function openAddAdminLink() {
     setEditingAdminLinkId(null);
     setAdminLinkError(null);
     setAdminLinkForm({ label: "", url: "" });
+    loadAdminLinkPorts();
   }
 
   function startEditAdminLink(link: ServerLink) {
     setEditingAdminLinkId(link.id);
     setAdminLinkError(null);
     setAdminLinkForm({ label: link.label, url: link.url });
+    loadAdminLinkPorts();
+  }
+
+  function pickAdminLinkPort(key: string) {
+    setAdminLinkPortPick(key);
+    const entry = adminLinkPorts?.find((p) => `${p.protocol}:${p.port}` === key);
+    if (!entry || !adminLinkForm) return;
+    const address = detail?.server.hostname || detail?.ipAddresses[0] || null;
+    const url = guessAdminUrl(address, entry);
+    setAdminLinkForm({
+      label: adminLinkForm.label || entry.label || entry.agent?.process || "",
+      url: url ?? adminLinkForm.url,
+    });
   }
 
   function cancelAdminLinkForm() {
     setAdminLinkForm(null);
     setEditingAdminLinkId(null);
     setAdminLinkError(null);
+    setAdminLinkPorts(null);
+    setAdminLinkPortPick("");
   }
 
   async function submitAdminLink(e: React.FormEvent) {
@@ -400,6 +428,24 @@ export default function ServerDetail({ user }: { user: CurrentUser }) {
                   onChange={(e) => setAdminLinkForm({ ...adminLinkForm, url: e.target.value })}
                 />
               </div>
+              {!!adminLinkPorts?.length && (
+                <div className="col-12">
+                  <label className="form-label">Fill from a known port (optional)</label>
+                  <select
+                    className="form-select"
+                    style={{ maxWidth: 460 }}
+                    value={adminLinkPortPick}
+                    onChange={(e) => pickAdminLinkPort(e.target.value)}
+                  >
+                    <option value="">— pick a port to fill in the URL above —</option>
+                    {adminLinkPorts.map((p) => (
+                      <option key={`${p.protocol}:${p.port}`} value={`${p.protocol}:${p.port}`}>
+                        {portOptionLabel(p)}
+                      </option>
+                    ))}
+                  </select>
+                </div>
+              )}
               <div className="col-md-3 d-flex gap-2">
                 <button type="submit" className="btn btn-primary" disabled={savingAdminLink}>
                   {editingAdminLinkId ? "Save" : "Add"}
diff --git a/web/src/utils/adminLinkUrl.ts b/web/src/utils/adminLinkUrl.ts
new file mode 100644
index 0000000..e48e69d
--- /dev/null
+++ b/web/src/utils/adminLinkUrl.ts
@@ -0,0 +1,20 @@
+import type { PortEntry } from "../api/client";
+
+// Common admin-panel ports that are HTTPS-only (often with a self-signed cert) even though nothing
+// on the wire says so — a small, honest guess, not a detection. Anything else defaults to http://,
+// and the URL field stays a normal editable text input either way.
+const HTTPS_PORTS = new Set([443, 5001, 8006, 8007, 8443, 9090, 9443, 10000]);
+
+/** What to show for one port in a "fill from a known port" picker. */
+export function portOptionLabel(entry: PortEntry): string {
+  const bits = [`${entry.port}/${entry.protocol}`];
+  if (entry.agent?.process) bits.push(entry.agent.process);
+  if (entry.label) bits.push(entry.label);
+  return bits.join(" — ");
+}
+
+/** A best-effort URL for a server's port, or null if no address is known for it yet. */
+export function guessAdminUrl(address: string | null, entry: PortEntry): string | null {
+  if (!address) return null;
+  return `${HTTPS_PORTS.has(entry.port) ? "https" : "http"}://${address}:${entry.port}`;
+}