Network Port
Port 81
Custom / ephemeral port
Total Hosts
525,405
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 | 15,780 |
| Apache | 5,864 |
| nginx | 5,484 |
| Tengine | 4,616 |
| webserver | 3,606 |
| Microsoft-IIS/10.0 | 2,866 |
| Webs | 2,651 |
| CW | 2,414 |
| DNVRS-Webs | 1,765 |
| App-webs/ | 1,679 |
| nginx/1.18.0 (Ubuntu) | 1,432 |
| nginx/1.20.1 | 924 |
Top Countries
Top ASNs
| ASN | Name | IPs |
|---|---|---|
| AS396982 | Google Cloud | 37,746 |
| AS37963 | Alibaba (China) | 13,336 |
| AS19551 | Thales/Imperva | 8,851 |
| AS4134 | China Telecom | 6,549 |
| AS9488 | — | 6,528 |
| AS7472 | — | 4,643 |
| AS197207 | Mobile Communication Company of Iran | 4,291 |
| AS139341 | ACE CDN | 3,973 |
| AS1659 | Taiwan Academic Network(TANet) | 3,722 |
| AS1715 | — | 3,658 |
| AS13335 | Cloudflare | 3,580 |
| AS40509 | — | 3,447 |
Wappalyzer Tech-Stack on Port 81
| Technology | Hosts |
|---|---|
| jQuery | 2,630 |
| RequireJS | 1,321 |
| Bootstrap | 670 |
| jQuery UI | 453 |
| Prototype | 330 |
| jsDelivr | 231 |
| Font Awesome | 111 |
| Popper | 110 |
| jQuery CDN | 103 |
| Vue.js | 100 |
| jQuery Migrate | 85 |
| crypto-js | 79 |
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.