Ip subnet lookup

Ip subnet lookup DEFAULT

ARIN is a nonprofit, member-based organization that administers IP addresses & ASNs in support of the operation and growth of the Internet.

Read the blog Draft Policies Under Discussion at ARIN 48

Draft Policies Under Discussion at ARIN 48

ARIN 48 is just around the corner! Sean Hopkins, Senior Policy Analyst, helps us get to know the draft policies up for discussion next week at the ARIN 48 Public Policy Meeting.

Read the blog Changing to a Proactive, Managed, and Strategic Approach to IPv6 Deployment

Changing to a Proactive, Managed, and Strategic Approach to IPv6 Deployment

Merit Network Inc., a non-profit, member-owned organization that runs a regional Research & Education (REN) network for the state of Michigan, recently completed an IPv6 Readiness Program.

Read the blog CrypTech Project: Making the Internet a Little Bit Safer

CrypTech Project: Making the Internet a Little Bit Safer

Since 2014, CrypTech has been trying to make the Internet safer to use with its open-source hardware engine that will meet the needs of Internet infrastructure systems that use cryptography. CrypTech received a grant from ARIN this year to help facilitate its ongoing project.

Sours: https://www.arin.net/

Subnet mask calculator

With subnet mask you can split your network into subnets. Enter your IP address and play with the second netmask until the result matches your need.

This type of notation is also known as CIDR. CIDR (Classless Inter-Domain Routing, sometimes known as supernetting) is a way to allocate and specify the Internet addresses used in inter-domain routing more flexibly than with the original system of Internet Protocol (IP) address classes.


Network Address:
Broadcast Address:
First host:
Last host:
Total host count:

Term definitions

Wildcard: Inverse of netmask. Used by certain firewalls for access control list

Broadcast: IP broadcast addresses are used for single-packet one-to-everyone delivery. A sending host addresses the IP packet using a broadcast address and every node on the sending node's network segment receives and processes the packet. IP broadcast addresses can be used only as the destination IP address. IP routers do not forward network broadcast packets.

Sours: http://www.aboutmyip.com/AboutMyXApp/SubnetCalculator.jsp
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IP Address

Enter an IP addresses, autonomous system number (ASN), organization or customer name

To obtain a more specific response, you may conduct a search by using certain flags. Many of these flags can be combined to tailor the desired output. Flags must be separated from each other and from the search term by a space. Your results will vary depending on the refinements you apply in your search. Listed below are the flags currently available; you may only use one flag from each flag-type in a query, i.e. one record type, one attribute, etc.


To limit your query to a specific record type, include one of the following flags:

Network address space
Autonomous systems
End-user customers


To limit your query to a specific record attribute, include one of the following flags:

Searches for matches by domain-portion of an email address
Searches for matches by handle or id
Searches for matches by name

Searches that retrieve a single record will display the full record. Searches that retrieve more than one record will be displayed in list output.

Display flags

To modify the way that the query results display, include one of the following flags:

FULL output shows detailed display for EACH match
LIST output shows summary only, even if single match returned

The + flag cannot be used with the sub-query featured described below.

Record hierarchy

Records in the ARIN WHOIS database have hierarchical relationship with other records. To display those related records, use the following flags:

Displays the record related up the hierarchy. For a network, display the supernet, or parent network in detailed format
Displays the record related down the hierarchy. For a network, display the subdelegations, or subnets, below the network, in list format. For an organization or customer, display the resources registered to that organization or customer, in list format

Wild card queries

WHOIS supports wild card queries. This feature is only supported as a trailing character option. To take advantage of this append the query with an asterisk . This can also be used in combination with any flags defined above.

Other helpful hints

To guarantee matching only a single record, look it up by its handle using a handle-only search. In the record summary line, the handle is shown in parenthesis after the name.

When using a handle to conduct a search for POC information, be sure to add the extension.

Queries that return more than 256 results will stop displaying data after the 256th result. You may want to narrow your search criteria or add flags to your query to limit the results.

To search on an individual's name, you may enter the last name, or to further restrict results, use the last name and first name, separated by a comma. For example: .

Sours: http://itools.com/tool/arin-whois-domain-search
subnetting is simple


About IP WHOIS - Check Who Owns an IP Address

IP WHOIS Lookup Tool offers a free IP Lookup Service to check who owns an IP address. Just enter an IP and perform the IP Lookup to find which organization or individual owns that specific IP address.

IP WHOIS Lookup Tool

Go for Lookup IP WHOIS information using the IP WHOIS Lookup tool for any allocated IP address. 

The IP WHOIS information contains

  • The contact information of the IP address owner.
  • The Regional Internet Registry (RIR); which assigns that IP address.
  • The autonomous system (AS) numbers.
  • The designated owner, location, contact information, and abuse reporting details.
  • The number of IP addresses in the block or blocks assigned to the owner of the IP you are researching.

What is IP address ownership?

Someone somewhere owns an IP address that is in use on the internet. An Internet Assigned Numbers Authority (IANA) is responsible worldwide for managing the allocation of IP addresses. The organization is responsible for reporting the information, for example, IP address, root zone management in DNS, ASNs allocation, and other Internet numbers and Internet Protocol-related symbols.

The Internet Assigned Numbers Authority further assigns Internet number resources (IP addresses and AS numbers) to regional internet registries (RIRs). These registries are responsible for allocating and registering Internet number resources within a specific region of the globe. 

Each RIR has its regional rules and policies and follows those to assign the IP addresses and AS numbers to their customers, including ISPs and end-user organizations.

Every IP address that floats on the global public internet is administrated by one of the five RIRs, each working within a specific region of the globe. The RIRs and their regulatory areas are as follows.

  • African Network Information Centre (AfriNIC) Manages IP addresses for the Africa continent.
  • American Registry for Internet Numbers (ARIN) Manages IP addresses for the United States, Canada, and many Caribbean and North Atlantic islands.
  • Asia-Pacific Network Information Centre (APNIC) Manages IP addresses for Asia, Australia, and surrounding Countries.
  • Latin America and Caribbean Network Information Centre (LACNIC) Manages IP addresses for Latin America and the Caribbean.
  • Réseaux IP Européens Network Coordination Centre (RIPE NCC) Manages IP addresses for Europe, the Middle East, and the former USSR.

Note: Suppose an RIR assigns a block of IP addresses to one of its ISP in the United States. The same ISP further assigns a sub-block of those IP addresses to one of their customer in Canada. The IP address's location still is reported as being in United States. 

However, for more accurate geolocation data and to get IP's location from several geolocation databases, you may use the IP geolocation tool.

How to find the WHOIS information of the given IP address by using the IP WHOIS Lookup tool?

To find the WHOIS information of a particular IP address. Perform the following steps.

  • Open the IP WHOIS Lookup tool. 
  • Enter a valid IPv4 or IPv6 in the "Enter any Valid IP Address" section.
  • After entering the IP address, click on the "Lookup IP" button.
  • The tool performs the IP WHOIS lookup and provides you the WHOIS info of that particular IP address.

IP WHOIS Results

You will get the information you should contact to reach out to the IP address owner from the IP WHOIS results. You will most likely get the Internet Service Provider (ISP) information to whom the IP address is assigned. If someone tries to spam or hack you, etc., it's best to dig out the abuse information included in the results. Otherwise, using the non-abuse contact information will be your best option when attempting to reach the controlling party.

Can I see the WHOIS details of the end-user?

The WHOIS results provide the organization or individual's name against which the IP is registered in the IP WHOIS Database. Frequently it's an internet service provider (ISP). However, it's impossible to get the end-user information to whom the ISP assigns the IP. Only ISP has the original and exact details of its end-user. You can get it if the court directs the ISP to provide the end-user name, address, and contact information.

Sours: https://dnschecker.org/ip-whois-lookup.php

Subnet lookup ip

IP Subnet Calculator

This calculator returns a variety of information regarding Internet Protocol version 4 (IPv4) and IPv6 subnets including possible network addresses, usable host ranges, subnet mask, and IP class, among others.

IPv4 Subnet Calculator

IPv6 Subnet Calculator

A subnet is a division of an IP network (internet protocol suite), where an IP network is a set of communications protocols used on the Internet and other similar networks. It is commonly known as TCP/IP (Transmission Control Protocol/Internet Protocol).

The act of dividing a network into at least two separate networks is called subnetting, and routers are devices that allow traffic exchange between subnetworks, serving as a physical boundary. IPv4 is the most common network addressing architecture used, though the use of IPv6 has been growing since 2006.

An IP address is comprised of a network number (routing prefix) and a rest field (host identifier). A rest field is an identifier that is specific to a given host or network interface. A routing prefix is often expressed using Classless Inter-Domain Routing (CIDR) notation for both IPv4 and IPv6. CIDR is a method used to create unique identifiers for networks, as well as individual devices. For IPv4, networks can also be characterized using a subnet mask, which is sometimes expressed in dot-decimal notation, as shown in the "Subnet" field in the calculator. All hosts on a subnetwork have the same network prefix, unlike the host identifier, which is a unique local identification. In IPv4, these subnet masks are used to differentiate the network number and host identifier. In IPv6, the network prefix performs a similar function as the subnet mask in IPv4, with the prefix length representing the number of bits in the address.

Prior to the introduction of CIDR, IPv4 network prefixes could be directly obtained from the IP address based on the class (A, B, or C, which vary based on the range of IP addresses they include) of the address and the network mask. Since the introduction of CIDRs, however, assigning an IP address to a network interface requires both an address and its network mask.

Below is a table providing typical subnets for IPv4.

Prefix sizeNetwork maskUsable hosts per subnet
Class A
Class B
Class C
Sours: https://www.calculator.net/ip-subnet-calculator.html
IP address network and host portion - subnet mask explained - ccna 200-301 free -


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