diff --git a/frontend/src/components/panels/DetailPanel.tsx b/frontend/src/components/panels/DetailPanel.tsx
index 71cbe7d..8dc8843 100644
--- a/frontend/src/components/panels/DetailPanel.tsx
+++ b/frontend/src/components/panels/DetailPanel.tsx
@@ -1,20 +1,31 @@
-import { X, Edit, Trash2, ExternalLink } from 'lucide-react'
+import { useState } from 'react'
+import { X, Edit, Trash2, ExternalLink, Plus } from 'lucide-react'
 import { Button } from '@/components/ui/button'
+import { Input } from '@/components/ui/input'
 import { useCanvasStore } from '@/stores/canvasStore'
 import { NODE_TYPE_LABELS, STATUS_COLORS, type ServiceInfo } from '@/types'
+import { getServiceUrl } from '@/utils/serviceUrl'
 
 interface DetailPanelProps {
   onEdit: (id: string) => void
 }
 
 export function DetailPanel({ onEdit }: DetailPanelProps) {
-  const { nodes, selectedNodeId, setSelectedNode, deleteNode } = useCanvasStore()
+  const { nodes, selectedNodeId, setSelectedNode, deleteNode, updateNode } = useCanvasStore()
   const node = nodes.find((n) => n.id === selectedNodeId)
 
-  if (!node) return null
+  const [addingService, setAddingService] = useState(false)
+  const [newSvc, setNewSvc] = useState<{ port: string; protocol: 'tcp' | 'udp'; service_name: string }>({
+    port: '',
+    protocol: 'tcp',
+    service_name: '',
+  })
+
+  if (!node || node.data.type === 'groupRect') return null
 
   const { data } = node
   const statusColor = STATUS_COLORS[data.status]
+  const host = data.ip ?? data.hostname
 
   const handleDelete = () => {
     if (confirm(`Delete "${data.label}"?`)) {
@@ -22,6 +33,24 @@ export function DetailPanel({ onEdit }: DetailPanelProps) {
     }
   }
 
+  const handleAddService = () => {
+    const port = parseInt(newSvc.port, 10)
+    if (!newSvc.service_name.trim() || isNaN(port) || port < 1 || port > 65535) return
+    const svc: ServiceInfo = {
+      port,
+      protocol: newSvc.protocol,
+      service_name: newSvc.service_name.trim(),
+    }
+    updateNode(node.id, { services: [...(data.services ?? []), svc] })
+    setNewSvc({ port: '', protocol: 'tcp', service_name: '' })
+    setAddingService(false)
+  }
+
+  const handleRemoveService = (index: number) => {
+    const updated = data.services.filter((_, i) => i !== index)
+    updateNode(node.id, { services: updated })
+  }
+
   return (
     <aside className="w-72 shrink-0 flex flex-col border-l border-border bg-[#161b22] overflow-y-auto">
       {/* Header */}
@@ -53,24 +82,90 @@ export function DetailPanel({ onEdit }: DetailPanelProps) {
         {data.os && <DetailRow label="OS" value={data.os} />}
         {data.check_method && <DetailRow label="Check" value={data.check_method} mono />}
         {data.last_seen && (
-          <DetailRow
-            label="Last Seen"
-            value={new Date(data.last_seen).toLocaleString()}
-          />
+          <DetailRow label="Last Seen" value={new Date(data.last_seen).toLocaleString()} />
         )}
       </div>
 
       {/* Services */}
-      {data.services.length > 0 && (
-        <div className="px-4 py-3 border-t border-border">
-          <div className="text-xs text-muted-foreground mb-2">Services ({data.services.length})</div>
+      <div className="px-4 py-3 border-t border-border">
+        <div className="flex items-center justify-between mb-2">
+          <span className="text-xs text-muted-foreground">
+            Services{data.services.length > 0 ? ` (${data.services.length})` : ''}
+          </span>
+          <button
+            onClick={() => setAddingService((v) => !v)}
+            className="flex items-center gap-1 text-[10px] text-[#00d4ff] hover:text-[#00d4ff]/80 transition-colors"
+          >
+            <Plus size={10} /> Add
+          </button>
+        </div>
+
+        {/* Add service form */}
+        {addingService && (
+          <div className="flex flex-col gap-1.5 mb-2 p-2 rounded-md bg-[#0d1117] border border-[#30363d]">
+            <Input
+              value={newSvc.service_name}
+              onChange={(e) => setNewSvc((s) => ({ ...s, service_name: e.target.value }))}
+              placeholder="Service name"
+              className="bg-[#21262d] border-[#30363d] text-xs h-7"
+              autoFocus
+            />
+            <div className="flex gap-1.5">
+              <Input
+                type="number"
+                value={newSvc.port}
+                onChange={(e) => setNewSvc((s) => ({ ...s, port: e.target.value }))}
+                placeholder="Port"
+                min={1}
+                max={65535}
+                className="bg-[#21262d] border-[#30363d] font-mono text-xs h-7 w-20 shrink-0"
+              />
+              <select
+                value={newSvc.protocol}
+                onChange={(e) => setNewSvc((s) => ({ ...s, protocol: e.target.value as 'tcp' | 'udp' }))}
+                className="flex-1 bg-[#21262d] border border-[#30363d] rounded-md text-xs h-7 px-1.5 text-foreground"
+              >
+                <option value="tcp">tcp</option>
+                <option value="udp">udp</option>
+              </select>
+            </div>
+            <div className="flex gap-1.5">
+              <Button
+                size="sm"
+                className="flex-1 h-6 text-[10px] bg-[#00d4ff] text-[#0d1117] hover:bg-[#00d4ff]/90"
+                onClick={handleAddService}
+              >
+                Add
+              </Button>
+              <Button
+                size="sm"
+                variant="ghost"
+                className="h-6 text-[10px]"
+                onClick={() => setAddingService(false)}
+              >
+                Cancel
+              </Button>
+            </div>
+          </div>
+        )}
+
+        {data.services.length > 0 && (
           <div className="flex flex-col gap-1.5">
-            {data.services.map((svc) => (
-              <ServiceBadge key={`${svc.port}-${svc.protocol}`} svc={svc} ip={data.ip} />
+            {data.services.map((svc, i) => (
+              <ServiceBadge
+                key={`${svc.port}-${svc.protocol}-${i}`}
+                svc={svc}
+                host={host}
+                onRemove={() => handleRemoveService(i)}
+              />
             ))}
           </div>
-        </div>
-      )}
+        )}
+
+        {data.services.length === 0 && !addingService && (
+          <p className="text-[10px] text-muted-foreground/50">No services — click Add to register one.</p>
+        )}
+      </div>
 
       {/* Notes */}
       {data.notes && (
@@ -82,20 +177,10 @@ export function DetailPanel({ onEdit }: DetailPanelProps) {
 
       {/* Actions */}
       <div className="mt-auto flex gap-2 px-4 py-3 border-t border-border">
-        <Button
-          size="sm"
-          variant="secondary"
-          className="flex-1 gap-1.5"
-          onClick={() => onEdit(node.id)}
-        >
+        <Button size="sm" variant="secondary" className="flex-1 gap-1.5" onClick={() => onEdit(node.id)}>
           <Edit size={14} /> Edit
         </Button>
-        <Button
-          size="sm"
-          variant="destructive"
-          className="gap-1.5"
-          onClick={handleDelete}
-        >
+        <Button size="sm" variant="destructive" className="gap-1.5" onClick={handleDelete}>
           <Trash2 size={14} />
         </Button>
       </div>
@@ -126,39 +211,33 @@ const CATEGORY_COLORS: Record<string, string> = {
   remote: '#8b949e',
 }
 
-function getServiceUrl(svc: ServiceInfo, ip?: string): string | null {
-  if (!ip) return null
-  const name = svc.service_name.toLowerCase()
-  const isHttps = name.includes('https') || name.includes('ssl') || svc.port === 443 || svc.port === 8443
-  const isHttp = name.includes('http') || [80, 8080, 8000, 3000, 8888, 9000, 8090, 7080].includes(svc.port)
-  if (isHttps) return `https://${ip}:${svc.port}`
-  if (isHttp) return `http://${ip}:${svc.port}`
-  return null
-}
-
-function ServiceBadge({ svc, ip }: { svc: ServiceInfo; ip?: string }) {
-  const url = getServiceUrl(svc, ip)
+function ServiceBadge({ svc, host, onRemove }: { svc: ServiceInfo; host?: string; onRemove: () => void }) {
+  const url = getServiceUrl(svc, host)
   const color = CATEGORY_COLORS[svc.category ?? ''] ?? '#8b949e'
 
   const inner = (
     <div
-      className="flex items-center justify-between gap-2 px-2 py-1.5 rounded-md border text-xs transition-colors"
+      className="group flex items-center justify-between gap-2 px-2 py-1.5 rounded-md border text-xs transition-colors"
       style={{
         background: '#21262d',
         borderColor: '#30363d',
-        ...(url ? { cursor: 'pointer' } : {}),
+        cursor: url ? 'pointer' : 'default',
       }}
     >
       <div className="flex items-center gap-1.5 min-w-0">
-        <span
-          className="shrink-0 w-1.5 h-1.5 rounded-full"
-          style={{ backgroundColor: color }}
-        />
+        <span className="shrink-0 w-1.5 h-1.5 rounded-full" style={{ backgroundColor: color }} />
         <span className="font-medium truncate" style={{ color }}>{svc.service_name}</span>
       </div>
       <div className="flex items-center gap-1.5 shrink-0">
         <span className="font-mono text-[#8b949e]">{svc.port}/{svc.protocol}</span>
         {url && <ExternalLink size={10} className="text-muted-foreground" />}
+        <button
+          onClick={(e) => { e.preventDefault(); e.stopPropagation(); onRemove() }}
+          className="opacity-0 group-hover:opacity-100 transition-opacity text-[#8b949e] hover:text-[#f85149] ml-0.5"
+          title="Remove service"
+        >
+          <X size={10} />
+        </button>
       </div>
     </div>
   )
diff --git a/frontend/src/components/panels/__tests__/DetailPanel.test.ts b/frontend/src/components/panels/__tests__/DetailPanel.test.ts
new file mode 100644
index 0000000..786a341
--- /dev/null
+++ b/frontend/src/components/panels/__tests__/DetailPanel.test.ts
@@ -0,0 +1,66 @@
+import { describe, it, expect } from 'vitest'
+import { getServiceUrl } from '@/utils/serviceUrl'
+import type { ServiceInfo } from '@/types'
+
+const svc = (port: number, protocol: 'tcp' | 'udp' = 'tcp', service_name = 'test'): ServiceInfo => ({
+  port,
+  protocol,
+  service_name,
+})
+
+describe('getServiceUrl', () => {
+  it('returns null when no host is provided', () => {
+    expect(getServiceUrl(svc(80), undefined)).toBeNull()
+  })
+
+  it('returns null for port 22 (SSH)', () => {
+    expect(getServiceUrl(svc(22, 'tcp', 'ssh'), '192.168.1.1')).toBeNull()
+  })
+
+  it('returns null for UDP services', () => {
+    expect(getServiceUrl(svc(53, 'udp', 'dns'), '192.168.1.1')).toBeNull()
+  })
+
+  it('returns null for known non-HTTP TCP ports', () => {
+    expect(getServiceUrl(svc(3306, 'tcp', 'mysql'), '192.168.1.1')).toBeNull()
+    expect(getServiceUrl(svc(5432, 'tcp', 'postgres'), '192.168.1.1')).toBeNull()
+    expect(getServiceUrl(svc(6379, 'tcp', 'redis'), '192.168.1.1')).toBeNull()
+    expect(getServiceUrl(svc(27017, 'tcp', 'mongodb'), '192.168.1.1')).toBeNull()
+  })
+
+  it('returns http URL for standard HTTP port', () => {
+    expect(getServiceUrl(svc(80, 'tcp', 'http'), '192.168.1.10')).toBe('http://192.168.1.10:80')
+  })
+
+  it('returns https URL for port 443', () => {
+    expect(getServiceUrl(svc(443, 'tcp', 'https'), '10.0.0.1')).toBe('https://10.0.0.1:443')
+  })
+
+  it('returns https URL for port 8443', () => {
+    expect(getServiceUrl(svc(8443), '10.0.0.1')).toBe('https://10.0.0.1:8443')
+  })
+
+  it('returns https URL when service name contains ssl', () => {
+    expect(getServiceUrl(svc(9443, 'tcp', 'my-ssl-app'), '10.0.0.1')).toBe('https://10.0.0.1:9443')
+  })
+
+  it('returns http URL for Sonarr on port 8989', () => {
+    expect(getServiceUrl(svc(8989, 'tcp', 'Sonarr'), '192.168.1.5')).toBe('http://192.168.1.5:8989')
+  })
+
+  it('returns http URL for Radarr on port 7878', () => {
+    expect(getServiceUrl(svc(7878, 'tcp', 'Radarr'), '192.168.1.5')).toBe('http://192.168.1.5:7878')
+  })
+
+  it('returns http URL for Jellyfin on port 8096', () => {
+    expect(getServiceUrl(svc(8096, 'tcp', 'Jellyfin'), '192.168.1.5')).toBe('http://192.168.1.5:8096')
+  })
+
+  it('returns http URL for Proxmox web UI on port 8006', () => {
+    expect(getServiceUrl(svc(8006, 'tcp', 'Proxmox'), '192.168.1.100')).toBe('http://192.168.1.100:8006')
+  })
+
+  it('uses host string directly (works with both IP and hostname)', () => {
+    expect(getServiceUrl(svc(80), 'myserver.lan')).toBe('http://myserver.lan:80')
+  })
+})
diff --git a/frontend/src/utils/serviceUrl.ts b/frontend/src/utils/serviceUrl.ts
new file mode 100644
index 0000000..b90d061
--- /dev/null
+++ b/frontend/src/utils/serviceUrl.ts
@@ -0,0 +1,34 @@
+import type { ServiceInfo } from '@/types'
+
+// Ports that are definitely not HTTP/web services (port 22/SSH handled separately)
+const NON_HTTP_PORTS = new Set([
+  21,             // FTP
+  23,             // Telnet
+  25, 465, 587,   // SMTP
+  53,             // DNS
+  110, 143, 993, 995,   // IMAP / POP3
+  389, 636,       // LDAP
+  445,            // SMB
+  514,            // Syslog
+  1433,           // MSSQL
+  3306,           // MySQL
+  5432,           // PostgreSQL
+  5672,           // RabbitMQ AMQP
+  6379,           // Redis
+  9092,           // Kafka
+  11211,          // Memcached
+  27017, 27018,   // MongoDB
+])
+
+export function getServiceUrl(svc: ServiceInfo, host?: string): string | null {
+  if (!host) return null
+  if (svc.port === 22) return null        // SSH — no browser
+  if (svc.protocol === 'udp') return null // UDP — not HTTP
+  if (NON_HTTP_PORTS.has(svc.port)) return null
+
+  const name = svc.service_name.toLowerCase()
+  const isHttps =
+    name.includes('https') || name.includes('ssl') || name.includes('tls') ||
+    svc.port === 443 || svc.port === 8443
+  return `${isHttps ? 'https' : 'http'}://${host}:${svc.port}`
+}