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Find the active Wi-Fi network name of the wireless router your iPad is currently connected to. Your router's external IP address is what the rest of the world uses to find you on the Internet.
To find your routers internal IP address the easiest method is with a little command line tool called ipconfig that comes with Windows. REMEMBER: This is the IP address that you use to configure your router for port forwarding. The easiest way to determine your routers external IP address is to visit a website that reports it back to you.
An Internet Protocol (IP) address is a numeric label consisting of a 32 bit number assigned to a network capable device that uses IP for communication. There were five IP address classes in use before the majority of industry switched to classless routing. Class A IP addresses were used for networks that had a large number of hosts on the network. The IETF identified the problem with the rapid exhaustion of the IPv4 address space several decades ago. After the invention of the Domain Name System (DNS), industry realized that the use of IP address classes would limit the scalability of the Internet.
In classless IP address, a subnet mask is used on a network to define how many bits are used for the network address and how many are used for the host address. Unfortunately, at the time of this writing the answer remains “It depends.” The discussion of running out of IP addresses has been ongoing for more than a decade, and it will likely continue to do so for at least another. I’d look at the WHOIS record for each of the IP addresses to see what the actual size of each of the networks is. Classless subnetting was introduced primarily to allow IP addresses to be allocated more efficiently.
I want to know if an email sent from the following IP address, could have been sent from the system as any of other 4 emails, having similar IP addresses.
Use this IP address to login to your router and configure it for things like port forwarding.
Tell this IP address to people who are trying to connect to you if you are hosting a game or other kind of server. The specific address class would determine the maximum potential size for a computer network. The address fundamentally serves two purposes: location addressing and computer host or network interface identification. The protocol is designed to be used in a packet-switched computer network and provides for the transmission of data packets (defined as datagrams) from source devices to destinations. The class permitted up to 126 networks by using the first octet of the address for the network identification. They allow 16,384 networks by using the first two octets in the address for the network identification. They allow for approximately 2 million networks by using the first three octets of the address for the network identification.
Despite the invention of classless IP addressing, it was assessed that a new addressing protocol was required to address long term needs.
As a result, the IETF published RC 1518 and 1519 in 1993 to define the classless method of routing IPv4 data packets.


The advent of Network Address Translation (NAT) and Dynamic Host Control Protocol (DHCP) has been implemented and very successful. You can use the free software tools or the windows command prompt to find your router's IP address. The address class would define which of the specific bits of the address would be used to identify the network and network identification, the bits to identify the host computer and host ID, and total number of host subnets permitted per network. The source and destination devices are identified by a fixed length address defined by the protocol. This range is reserved by the IETF and similar to Class D networks, should not be assigned to a host device. When overlay on a host address, it tells the host or device what part of the IP address is the network address and which is used for the host. As a result, consumers have essentially been sharing IP addresses through their ISP without really noticing for the past decade. They might be in the same datacenter, or they might be different houses on a cable modem network. A significant limitation of the legacy IPv4 addressing is that it supports less than 4.3 billion total addresses.
The specification also takes into account fragmentation of data and the reassembly of longer blocks of data when required. Class B was designed for use on medium to large networks, and C for small local area networks (LANs). The following seven bits in the octet were then set to one which would complete the network identification.
The resulting address space was then increased from 32 to 128 bits (16 octets) and deemed to be adequate for at least the mid-term requirements for Internet growth. The addresses include a 40-bit pseudorandom number which minimizes the risk of address collisions if packets are routed inappropriately or sites merge. Classless IP addressing was introduced as a more efficient means to make use of the IP address space when compared to Classful addressing. As the popularity for “Always On,” high demand services such as video or television streaming increases; however, the quality of service realized at the user level may start to suffer. Although the IP class term will commonly be used to describe the difference between one network and another, the practical use of addressing is not commonly used any more.
Based on the rapid growth of the Internet and related technologies, the use of IPv4 is not sustainable for the long term. The IP specification does not address data reliability, flow control, sequencing, quality of service, etc.
The remaining octets (24 bits) represented the hosts ID and would allow up to 126 networks with 17 million hosts per network.
The design of IPv6 incorporates the idea of allowing efficient aggregation of subnet routing prefix at the router level. None of the current or legacy IPv6 private address prefixes are supposed to be routed on the public Internet just like the behavior expected from IPv5.
In classless addressing, the IP address is treated as a 32 bit stream where the boundary between the network identification and host can be at any of the bit positions. Every subnet address on a large network will have its own subnet mask which in essence means the specific subnet has a subnet mask.
Just think if you could not watch your favorite sitcom because all of the users in your assigned addressing block with the ISP were actually 1 – Online, and 2 – Actively using their Internet connection at the same time.


It has been replaced with classless addressing where a netmask can be assigned to any IP address range. In the mid-1990’s, the new IPv6 technique was developed which makes use of 128 bits for the IP address.
These aspects are handled by supporting technologies such as the TCP (transmission control protocol). In the following table, the four octets that make up an IP address (a, b, c, and d respectfully) are displayed in how they were distributed in classes A, B, and C. This results in the reduction of routing table sizes and actual address utilization rates being small on any IPv6 network segment.
Finally, despite the majority of modern operating systems now providing support for IPv6, it has not yet seen widespread deployment in the home networking, VoIP, and networking peripheral fields. The network portion of the address is determined by the number of 1’s that are in the subnet mask being applied to the address.
This allows for the current form of classless IP addressing that has been in use for IPv4 networks since the 1990s. This rarely occurs now, but as more and more of the devices in the home become “connected” it may in the future.
The four key mechanism used in the IP definition are: type of service, time to live, options, and the header checksum.
The design also allows for the separation of the addressing infrastructure of a local segment’s space from the addressing used to route to or from external network traffic.
A subnet mask is used locally on the hosts connected to the network and are never transmitted in an IPv4 data packet or datagram. The Internet Assigned Numbers Authority (IANA) is responsible under the IETF for management of the IP address space allocation globally.
Type of service is used to indicate the quality of service desired intended to be used by routers (or gateways) to select the transmission parameters applicable for the network or forwarding of the information.
The large number of network addresses also allows large blocks to be assigned for a specific purpose and when required aggregated for more efficient routing. All of the hosts on the same network are configured to use the same subnet mask with the host section of the IP address being unique to the host.
In the meantime; however, the Internet 2 research group is operating on and conducting research on what is considered to be the Internet of the future running on IPv6, providing significant quality of service improvements, and a higher data rate capacity than currently realized on networks running on the IPv4 standard. Beneath the IANA, there are five regional Internet registries (RIRs) that are responsible for allocating IP address blocks to Internet service providers (ISPs) and other trusted organizations. Time to live indicates the upper bound on how long the datagram or data packet should be forwarded until dropped.
The need for more complicated addressing conservation methods such as now used in Classless Inter-Domain Routing (CIDR) is also eliminated with the implementation of IPv6.
The classless version of address is referred to as Classless Inter-Domain Routing (CIDR) and allows networks to be divided into different-sized subnets. Options allow for control functions implemented for specific networks such as special routing, security, or timestamps but are not otherwise required for standard communication.



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