You're reading from Practical Web Penetration Testing

Product typeBook

Published inJun 2018

PublisherPackt

ISBN-139781788624039

Edition1st Edition

Tools

Kali Linux

Concepts

Cybersecurity

Author (1)

Gus Khawaja

Networking Reference Section

Networking is a major topic in penetration testing. In this appendix, I have gathered together all the important information so that you can refer to it when you need to.

Network subnets

Sometimes, you will be given subnet masks (a range of IP addresses) to test, and in some cases, you will test only one single IP address. If you're using a subnet mask, then use the following table as a reference:

CIDR	Hosts	Net mask
/30	2	`255.255.255.252`
/29	6	`255.255.255.248`
/28	14	`255.255.255.240`
/27	30	`255.255.255.224`
/26	62	`255.255.255.192`
/25	126	`255.255.255.128`
/24	254	`255.255.255.0`
/23	510	`255.255.254.0`
/22	1022	`255.255.252.0`
/21	2046	`255.255.248.0`
/20	4094	`255.255.240.0`
/19	8190	`255.255.224.0`
/18	16382	`255.255.192.0`
/17	32766	`255.255.128.0`
/16	65534	`255.255.0.0`

Port numbers and services

Well-known ports: 0-1023

Registered ports: 1024-49,151

Dynamic ports: 49,152-65,535

Most common ports and services:

Protocol name	TCP/UDP	Port number
File Transfer Protocol (FTP)	TCP	`20`, `21`
Secure Shell (SSH)	TCP	`22`
Telnet	TCP	`23`
Simple Mail Transfer Protocol (SMTP)	TCP	`25`
Domain Name System (DNS)	TCP/UDP	`53`
Dynamic Host Configuration Protocol (DHCP)	UDP	`67, 68`
Trivial File Transfer Protocol (TFTP)	UDP	`69`
Hypertext Transfer Protocol (HTTP)	TCP	`80`
Post Office Protocol version 3 (POP3)	TCP	`110`
NetBIOS	TCP/UDP	`137, 138, 139`
Internet Message Access Protocol (IMAP)	TCP	`143`
Simple Network Management Protocol (SNMP)	UDP	`161, 162`
Lightweight Directory Access Protocol (LDAP)	TCP	`389`
Hypertext Transfer Protocol over SSL/TLS (HTTPS)	TCP	`443`
Lightweight Directory Access Protocol over TLS/SSL (LDAPS)	TCP	`636`
FTPS — FTP over...

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Author (1)

Gus Khawaja

Gus Khawaja holds a bachelor's degree in computer science. He specializes in IT security and ethical hacking. He is an author and shares his passion with millions of viewers around the world using his online courses. He also works as a cybersecurity consultant in Montreal, Canada. After many years of experience in programming, he turned his attention to cybersecurity and the importance that security brings to this minefield. His passion for the ethical hacking mixed with his background in programming and IT makes him a wise swiss-knife professional in the computer science domain.
Read more about Gus Khawaja

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