#ANGRY IP SCANNER TUTORIAL CRACKER#
#ANGRY IP SCANNER TUTORIAL PATCH#

CIDR then came to help with the introduction of network masks and special prefix notation, meaning how many bits from left to right are the same in all addresses that are on the same network. 24), as opposed to the early “classful” Internet, where address ranges were divided into classes of fixed size (A, B, C – with prefixes of 8, 16, 24 bits respectively) and were assigned to organizations only wholly. However, different tricks were employed in order to prolong IPv4 usage, such as CIDR and NAT – it is too expensive to make such a big switch.ĬIDR stands for Classless Inter-Domain Routing, that gave us “network prefix” size notation (e.g.

In order to fix the problem, IPv6 was introduced at the end of the previous decade, that among other features provides a much broader address space of 128 bits. Most of the world still uses the older IPv4 version of the protocol, that limits the address space to 32 bits, making the maximum number of directly addressable nodes to be less than 4 billion, which will soon not be enough for current Earth’s population of over 6 billion and the increasing usage of computers and mobile devices. An IP address is the unique identifier of a network interface in the network. Nowadays, thanks to the Internet, TCP/IP is the most widely spread network protocol that over the years has replaced many other LAN and WAN protocols – it is now used in the majority of networks not even directly connected to the Internet. IP, in “IP address” and “IP scanner”, means nothing more complex than Internet Protocol.

Higher level protocols are interesting because they are actually the ones users are most interested in, thus network scanners most often reach these layers too in order to detect the actual running services that make use of scanned network and transport endpoints (addresses and ports). While the layers 3 and 4 are the most interesting to scanners – they are guaranteed to exist in any (IP-based) network regardless of physical mediums and provided higher level services, other layers can be interesting as well: local network scans can make use of the 1st and the 2nd layers in order to bypass higher level filtering. The famous OSI model defines seven layers of networking protocols. The point here is that thanks to bridges between networks, all of them can use different physical (and data link) mediums for communication, with PPP over dial-up, IEEE 802.3 (Ethernet), and 802.11 (Wi-Fi) being the most popular. Theory of network scanning NetworkingĬomputer networks, especially large ones, are very heterogeneous – they are composed of many interconnected devices into subnetworks using different topologies, which are in their own turn interconnected into larger networks, etc. However, Angry IP Scanner aims to be very friendly to novice users as well. The program’s target audience are network administrators, consultants, developers, who all use the tool every day and therefore have advanced requirements for usability, configurability, and extensibility.

Secure networks are possible only with the help of open-source systems and tools, possibly reviewed by thousands of independent experts and hackers alike.Ĭertainly, there are other network scanners in existence (especially single-host port scanners), however, most of them are not cross-platform, are too simple and do not offer the same level of extensibility and user-friendliness as Angry IP Scanner. As a rule, almost all such programs are open-source, because they are developed with the collaboration of many people without having any commercial goals.

#ANGRY IP SCANNER TUTORIAL PATCH#

But why do administrators need to scan their own networks? There are plenty of answers: to check status of computers and various network devices (are they up or down), find spare addresses in statically-addressed networks, monitor the usage of server-type or P2P applications, make inventory of available hardware and software, check for recently discovered holes in order to patch them, and much more things that are even difficult to foresee.Īngry IP Scanner is widely-used open-source and multi-platform network scanner.

#ANGRY IP SCANNER TUTORIAL CRACKER#

Thanks to the recent activity of mass-media on the subject (that popularized the wrong term for a cracker – a ‘hacker’), nowadays every educated person more or less understands the reasons and goals that stand behind malicious cracking: curiosity, stealing of information, making damage, showing self-importance to the world, etc.

Although it is widely accepted that activity of the latter is often illegal, most of the time they depend on exactly the same tools that can be used for perfectly legitimate network administration – just like a kitchen knife that can be used maliciously. Scanning of computer networks (searching for addresses with known properties) is a practice that is often used by both network administrators and crackers.

Angry ip scanner tutorial