Task 1: Scan Your Local Network for Open Ports

Objective

To discover active devices and open ports on the local network using Nmap and understand potential security exposure.

Tools Used

• Nmap 7.99
• Windows Command Prompt

Network Range

192.168.31.0/24

Command Used

nmap -T4 -F 192.168.31.0/24

Scan Results

Router (192.168.31.1)

Port	Service
53	DNS
80	HTTP
443	HTTPS
7443	Oracle AS HTTPS
8080	HTTP Proxy
8443	HTTPS Alternate

Device (192.168.31.29)

Port	Service
8000	HTTP Alternate
9010	SDR

Samsung Device (192.168.31.122)

Port	Service
80	HTTP
443	HTTPS
4443	Pharos
7676	IMQ Broker

Set Top Box (192.168.31.181)

Port	Service
2869	ICSLAP

My System (192.168.31.228)

Port	State	Service
135	Open	MSRPC
139	Open	NetBIOS Session Service
445	Open	Microsoft-DS
2968	Open	ENPP
25	Filtered	SMTP
110	Filtered	POP3
548	Filtered	AFP

Security Analysis

Port 53 (DNS)

Used for domain name resolution. Misconfigured DNS services may be abused for attacks.

Port 80 (HTTP)

Transmits data without encryption. Sensitive information may be exposed.

Port 443 (HTTPS)

Encrypted web communication. Generally secure when properly configured.

Port 445 (Microsoft-DS)

Used for Windows file sharing. Frequently targeted by malware and ransomware if exposed.

Port 139 (NetBIOS)

Can reveal network information and should not be exposed to untrusted networks.

Port 8080

Alternative web service port. Should be monitored and secured.

Risks Identified

• Multiple web services exposed on the router.
• Windows file sharing ports (139 and 445) open on the host machine.
• Several IoT devices expose services that should be monitored.
• Unnecessary services increase attack surface.

Conclusion

Successfully scanned the local network using Nmap and identified active hosts and open ports. The scan provided insight into network exposure and potential security risks associated with publicly accessible services.