Why network diagrams need to stay current
A network diagram that's six months out of date is worse than no diagram at all — it gives false confidence during incidents and sends engineers to the wrong place. The reason most network diagrams go stale is that updating them is too slow. flow-chart.io makes it fast enough to actually do after each change.
Describe the current state of your network and get a diagram in seconds. Every node is editable, every connection is a live object you can relabel or reroute. Export, embed in your runbook, and move on.
What flow-chart.io generates for network diagrams
- Logical topology diagrams — routers, switches, firewalls, load balancers, and servers as labeled nodes
- VLAN and subnet boundaries — zone containers with CIDR labels for each network segment
- WAN and internet connections — ISP uplinks, VPN tunnels, and Direct Connect/ExpressRoute links
- DMZ and security zone separation — perimeter, internal, and management zones visually distinct
- Connection labels — bandwidth, protocol, and port annotations on each link
- Physical and logical views — same infrastructure, two levels of abstraction
How to create a network diagram
- Sign up free — 5 diagrams, no credit card required.
- Select the Network Diagram domain in the diagram type picker.
- Describe your network — e.g. "Office network: ISP → edge router → firewall → core switch → 3 VLANs (servers 10.0.1.0/24, workstations 10.0.2.0/24, guest WiFi 10.0.3.0/24). Site-to-site VPN to AWS VPC."
- Edit and export — update IP ranges, add new devices, reroute links; export as SVG or PNG for your documentation.
Frequently asked questions
- Can I diagram both physical and logical network topology?
- Yes. Describe either view — logical (how traffic flows) or physical (which cable connects to which port) — and the AI generates the appropriate diagram. You can generate both views from the same description.
- Does it support cloud network topology?
- Yes. VPC topology, subnet routing, security groups, and cloud-to-on-premises connectivity are all supported. Select the Cloud Architecture domain for AWS, GCP, or Azure-specific diagrams.
- Can I annotate connections with IP addresses and port numbers?
- Yes. Include the details in your description and the AI adds them as edge labels. You can also add or edit labels directly in the diagram editor after generation.
- Is this useful for security audits?
- Yes. Network diagrams with labeled trust zones, firewall positions, and data flows are a standard deliverable for penetration testing scopes and SOC 2 / ISO 27001 evidence packages.