Network Port
Port 81
Custom / ephemeral port
Total Hosts
490,147
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 | 14,680 |
| Apache | 5,485 |
| nginx | 5,078 |
| Tengine | 4,301 |
| webserver | 3,389 |
| Microsoft-IIS/10.0 | 2,657 |
| CW | 2,286 |
| Webs | 2,159 |
| App-webs/ | 1,589 |
| DNVRS-Webs | 1,425 |
| nginx/1.18.0 (Ubuntu) | 1,356 |
| nginx/1.20.1 | 854 |
Top Countries
Top ASNs
| ASN | Name | IPs |
|---|---|---|
| AS396982 | Google Cloud | 37,019 |
| AS37963 | Alibaba (China) | 12,595 |
| AS19551 | Thales/Imperva | 8,863 |
| AS4134 | China Telecom | 6,418 |
| AS9488 | — | 5,302 |
| AS197207 | Mobile Communication Company of Iran | 4,750 |
| AS7472 | — | 4,307 |
| AS139341 | ACE CDN | 3,863 |
| AS1659 | Taiwan Academic Network(TANet) | 3,632 |
| AS13335 | Cloudflare | 3,532 |
| AS1715 | — | 3,413 |
| AS40509 | — | 3,304 |
Wappalyzer Tech-Stack on Port 81
| Technology | Hosts |
|---|---|
| jQuery | 2,468 |
| RequireJS | 1,303 |
| Bootstrap | 620 |
| jQuery UI | 427 |
| Prototype | 321 |
| jsDelivr | 209 |
| Font Awesome | 104 |
| Popper | 99 |
| jQuery CDN | 93 |
| Vue.js | 92 |
| jQuery Migrate | 73 |
| crypto-js | 68 |
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.