host.tools

Port scanner

Network /api/v1/network/port

Probe the most-common 20 service ports — or a custom list.

Try: host.com 1.1.1.1 github.com
Related: Subnet / CIDR calculator
Host
10.0.0.0/8
Scanned
20
Open
0
Closed
20
21
FTP
closed
22
SSH
closed
23
Telnet
closed
25
SMTP
closed
53
DNS
closed
80
HTTP
closed
110
POP3
closed
143
IMAP
closed
443
HTTPS
closed
465
SMTPS
closed
587
Submission
closed
993
IMAPS
closed
995
POP3S
closed
3306
MySQL
closed
3389
RDP
closed
5432
Postgres
closed
6379
Redis
closed
8080
HTTP-alt
closed
8443
HTTPS-alt
closed
27017
MongoDB
closed
Sponsored host.tools Pro
Bulk lookups · monitors · webhooks · 10,000 API calls/day

Upgrade to Pro for $19/mo. Cancel anytime. Works with the same API you already use.
How to use Port scanner
  1. 1
    Paste your input

    Enter the value at the top — domain, IP, URL, email, ASN, hash, whatever fits this tool. The smart input auto-detects type.

  2. 2
    Click "Inspect"

    host.tools issues real probes (DNS, HTTP, TCP, TLS, WHOIS where applicable) and renders the result in milliseconds.

  3. 3
    Open the API tab

    Every web tool has a sibling /api/v1/network/port JSON endpoint with the same payload. One copy-as-curl click and you're scripting it.

Why this matters

Real probes from real boxes around the world. Synthetic uptime is fiction; multi-region reachability is the truth.

API equivalent
/api/v1/network/port?q=10.0.0.0%2F8 
curl -s '/api/v1/network/port?q=10.0.0.0%2F8'
Embed this tool
<iframe src="/network/port?q={INPUT}&embed=1"
  width="100%" height="600" frameborder="0"></iframe>

Drop into any HTML page. The embed=1 flag hides nav and footer.

FAQ · Port scanner

Common questions

Is Port scanner free?
Yes — every tool is free on the web with a 200/hour rate limit per IP. The matching API endpoint /api/v1/network/port is free up to 100 requests/hour, no key required.
Where does the data come from?
Real-time probes against authoritative sources (DNS root, RIRs, registries, the target server itself), plus partner data feeds from hostinfo.com (GeoIP/ASN) and hostcheck.com (reputation).
How fresh are the results?
Live by default. Cached for 5 minutes to make repeat queries instant; pass ?nocache=1 for a forced refresh.
Can I run this from the command line?
Yes — every tool ships with a copy-as-curl. There's also an official CLI: host.tools network port YOUR_INPUT.
Can I monitor results over time?
Pro tier lets you schedule any tool to run every 1/5/15/60 min and alert on diff. See monitors.
host.tools Pro

Run Port scanner on a schedule. Get pinged when it changes.

Pro gets you bulk lookups, monitors, webhook alerts, history, exports and 10,000 API calls/day. $19/mo.

See pricing Tour monitors
  • ✓Schedule any tool — every 1, 5, 15, 60 min
  • ✓Diff against last run, alert on change
  • ✓Webhook + email + Slack + PagerDuty + OpsGenie
  • ✓Bulk CSV upload, 1,000 inputs per job
  • ✓Export results as CSV / NDJSON / Excel
  • ✓90-day history, comparison view