Port Scanner Online

A port scanner (online port scanner or TCP port scanner) tests many ports on an IP address or domain in one run — faster than checking ports one by one.

VSPIC lets you scan open ports with presets (common, web, mail, remote access, database, gaming) or custom lists. Results show open vs closed with service names — for server port scanner and network port scanner workflows.

Authorized use only: scan infrastructure you own or have written permission to test.

Ports are numbered channels (0–65535) on an IP address. Multiple services share one IP — HTTPS on 443, SSH on 22, and so on.

An IP port scanner helps map which services are reachable from the internet, not from inside your LAN only.

This tool labels each probed port as:

Reference list aligned with the built-in port table on this page:

20 FTP Data

File transfer data channel.

21 FTP Control

FTP command channel.

22 SSH

Secure shell administration.

25 SMTP

Mail transfer (often blocked residential).

53 DNS

DNS (TCP used for large responses).

80 HTTP

Unencrypted web.

110 POP3

Email retrieval.

143 IMAP

Email sync.

443 HTTPS

Encrypted web — standard for public sites.

3306 MySQL

MySQL database — keep private.

3389 RDP

Windows Remote Desktop — high risk if public.

5432 PostgreSQL

PostgreSQL database.

6379 Redis

Redis — never expose without auth.

25565 Minecraft

Default Minecraft Java server port.

• Server administration — verify services after deploy.
• Network auditing — document exposed ports.
• Security assessments — find unexpected listeners (authorized targets only).
• Firewall testing — before/after rule changes.
• Application deployment — smoke test staging IPs.
• Connectivity troubleshooting — confirm forwarding works.

• See attack surface on public IPs.
• Confirm only intended ports are world-reachable.
• Validate cloud security groups match runbooks.
• Compare preset scans (web vs database) quickly.
• Support check open ports tickets with evidence.

Every open port is a potential entry point. Automated bots scan the entire internet continuously for Redis, RDP, and database ports left public.

Minimize exposure: VPN or IP allowlists for admin ports, patch services, and remove unused listeners.

Port checker on VSPIC tests one TCP port at a time — ideal for verifying a single forward (game port, 443, etc.).

Port scanner batches up to 40 ports per scan with presets or custom lists like 80,443,8080 or ranges 8000-8010.

Use both: scanner for overview, checker for deep retest on a specific port.

Stateful firewalls may allow established outbound but deny unsolicited inbound — scans from outside show only intentionally published services.

CDN and load balancers fronting web apps may show 443 open on edge IPs while origin remains hidden.

• Disable unused services and close their ports.
• Restrict management ports to VPN or office IP ranges.
• Monitor logs for scan and login attempts.
• Update software on every open service.
• Use strong authentication — SSH keys, no default DB passwords.

• Scan multiple ports in one request (max 40 per scan).
• Preset port groups: common (35 ports), web, mail, remote, database, gaming.
• Custom comma-separated ports or ranges.
• Use My IP button to fill your public address quickly.
• Fast results table with service names and latency.
• Free security port scanner for authorized diagnostics.

• IANA — Port numbers registry
• CISA — Securing network infrastructure