Public ip address
A public IPv4 address is a globally unique IPv4 network address routable on the public Internet and assigned to an internet-facing resource.
Amazon Web Services in Action, Third Edition: An in-depth guide to AWS
A public IPv4 address is an IPv4 network address routable from the public internet and assigned to an internet-facing resource.
- How it is used
- Provides an internet-reachable endpoint for an EC2 web server and can identify a client permitted through an HTTP security-group rule.
- How deep it goes
- Explains how to find and use an assigned address, allocate a fixed one, and restrict access with `/32`.
- Examples
- Uses an Apache website opened by IP address and a CloudFormation security-group rule parameterized with the client’s address.
- What you can do after
- Operate/configure it by finding an instance address, associating an Elastic IP, or limiting HTTP access to a client address.
Acing the CCNA Exam: Volume 2 Advanced Networking and Security
A public IPv4 address is an IPv4 address that is globally unique and intended for communication across the public internet.
- How it is used
- Supports internet communication by providing globally unique addresses and serving as the translated form of private internal addresses.
- How deep it goes
- Defines uniqueness, routability, reserved-range exclusions, and NAT translation, but does not detail public-address allocation.
- Examples
- Uses overlapping private LAN subnets, documentation address ranges, 8.8.8.8, and a router-mediated NAT exchange.
- What you can do after
- Evaluate whether an IPv4 address is public and understand why NAT is required for private hosts using the internet.
Read how Acing the CCNA Exam: Volume 2 Advanced Networking and Security explains public ip address →
Related concepts
- IPv4kind of · IPv4 is the fourth version of the Internet Protocol, using 32-bit addresses to identify network interfaces and packet sources or destinations.
- private ipv4 addresscontrasts with · A private IPv4 address is an address from a designated range intended for communication within private networks rather than direct routing on the public Internet.
- global unicast addressequivalent to · A global unicast address is an IPv6 unicast address that is globally unique and routable over the internet.
- Azure Load Balancerused by · Azure Load Balancer is a managed Azure service that distributes network traffic across backend resources according to configured rules and health status.
- network address translationproduced by · Network address translation is a networking technique that rewrites IP addresses and often transport-layer ports as traffic crosses a gateway or network boundary.
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