Network Port
Port 81
Custom / ephemeral port
Total Hosts
494,253
last 90 d
Countries
12
distinct
Top Software
openresty
from banners
CVE Hits
—
NVD feed pending
Service Detail
Port
81
Protocol
TCP / UDP
Service
—
IANA Reserved
—
Common Risk
—
Top Software on this Port
| Server / Banner | Hits |
|---|---|
| openresty | 14,787 |
| Apache | 5,527 |
| nginx | 5,116 |
| Tengine | 4,324 |
| webserver | 3,403 |
| Microsoft-IIS/10.0 | 2,677 |
| CW | 2,298 |
| Webs | 2,222 |
| App-webs/ | 1,597 |
| DNVRS-Webs | 1,452 |
| nginx/1.18.0 (Ubuntu) | 1,362 |
| nginx/1.20.1 | 868 |
Top Countries
Top ASNs
| ASN | Name | IPs |
|---|---|---|
| AS396982 | Google Cloud | 37,110 |
| AS37963 | Alibaba (China) | 12,637 |
| AS19551 | Thales/Imperva | 8,859 |
| AS4134 | China Telecom | 6,413 |
| AS9488 | — | 5,438 |
| AS197207 | Mobile Communication Company of Iran | 4,682 |
| AS7472 | — | 4,348 |
| AS139341 | ACE CDN | 3,865 |
| AS1659 | Taiwan Academic Network(TANet) | 3,655 |
| AS13335 | Cloudflare | 3,528 |
| AS1715 | — | 3,456 |
| AS40509 | — | 3,322 |
Wappalyzer Tech-Stack on Port 81
| Technology | Hosts |
|---|---|
| jQuery | 2,477 |
| RequireJS | 1,291 |
| Bootstrap | 621 |
| jQuery UI | 435 |
| Prototype | 316 |
| jsDelivr | 212 |
| Font Awesome | 103 |
| Popper | 100 |
| jQuery CDN | 95 |
| Vue.js | 94 |
| jQuery Migrate | 75 |
| crypto-js | 67 |
Recently Seen on Port 81
Hosts most recently observed with this port open in our scan sweep.
CVE Matches
No version-matched CVEs
No published CVE exactly matches a software version seen on this port. Banners often omit versions, which limits precise matching.