Port 1387CADSI-LM License Manager
Port 1387 is mainly utilized by LMS International’s license manager service, historically known as CADSI-LM, to facilitate software license management and distribution within corporate and engineering environments. This port handles communication between licensed engineering software applications and centralized license servers, ensuring legitimate access to specialized CAD tools..
- transport
- tcp · udp
- in transit
- cleartext
- assignment
- official
- risk
- 4/10
- lookups
- 6,020
2 transports registered
payload readable on path
registered with iana
caution
rank 827 of 993 · top 83%
Technical Details
what runs on :1387Port 1387 serves an important role in software license management systems, particularly those developed by LMS International (formerly CADSI). It enables communication between client applications running engineering or computer-aided design software and a centralized license server. The protocol implemented here authenticates license usage requests, checks out licenses to clients, and returns licenses upon completion.
This license management communication involves establishing sessions over both TCP and UDP. TCP is often used for reliable, initiated client-server communication such as license checkouts and returns. Meanwhile, UDP may be used for lightweight status or broadcast messages, facilitating efficient updates or license availability queries across a network.
This port is often integrated within enterprise networks hosting high-value engineering software, making it critical to core business workflows. Because license servers act as gatekeepers to expensive proprietary tools, ensuring seamless but secure operation over this port is imperative.
Security Information
exposure of :1387risk score
4/ 10caution
worth attention. how exposed you are depends on configuration — don't leave it reachable from the internet without a reason.
network services averages 3.9 across 604 ports — this one sits 0.1 above.
in transit
cleartext
credentials and payloads are readable by anyone on path
assignment
official
registered with iana for this service — scanners fingerprint it by number
reachable over
tcp · udp
udp is connectionless — source addresses are trivially spoofed and it is a reflection favourite
security overview
Common Vulnerabilities:
- License servers exposed to untrusted networks may be vulnerable to unauthorized license access or theft
- Lack of encryption on license communication can lead to interception or manipulation of license data
- Unauthenticated broadcast messages on UDP may be exploited for denial-of-service attacks or network mapping
Common Mitigations:
- Limit port exposure using firewalls to only trusted internal networks
- Employ VPNs or secure tunnels when license communication must traverse insecure links
- Regularly update license server software to patch security vulnerabilities
- Consider wrapping license server communications within encrypted protocols if supported by the vendor
- Restrict administrative access and enforce strong authentication where possible
Related Ports
the 8 most looked-up other ports in network services — 604 ports carry that label.
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|---|---|---|---|---|---|
| :9080 | Groove RPC | TCPUDP | Web Services | caution | 70.8k |
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| :5938 | TeamViewer | TCPUDP | Remote Access | caution | 65.0k |
| :8291 | Winbox MikroTik Admin | TCP | Security | caution | 62.9k |
| :3233 | WhiskerControl Protocol | TCPUDP | Network Services | caution | 61.9k |
| :3268 | Microsoft Global Catalog (GC) | TCPUDP | Security | caution | 54.6k |
| :135 | Microsoft EPMAP | TCPUDP | Security | caution | 51.9k |
| :3128 | Tatsoft Default HTTP Proxy | TCP | Web Services | caution | 46.8k |
risk mix of the 8 listed
- caution100%
0 of 8 encrypted