IPv4
IPv4 is the fourth version of the Internet Protocol, using 32-bit addresses to identify network interfaces and packet sources or destinations.
Acing the CCNA Exam: Volume 1 Fundamentals and Protocols
An IPv4 address is a 32-bit network-layer address used to identify a source or destination in IPv4 communication.
- How it is used
- Uses IPv4 addresses to identify Layer 3 hosts, support end-to-end delivery, and configure networks on Cisco routers.
- How deep it goes
- Explains 32-bit structure, dotted decimal notation, prefix lengths, network and host portions, but defers detailed routing decisions and subnetting.
- Examples
- Uses dotted-decimal addresses, LAN examples, prefix lengths, and a PC1-to-PC3 packet journey across routers.
- What you can do after
- Apply IPv4 addressing by configuring and verifying addresses on Cisco routers and distinguishing network, host, and next-hop information.
Read how Acing the CCNA Exam: Volume 1 Fundamentals and Protocols explains IPv4 →
Regular Expression Puzzles and AI Coding Assistants
An IPv4 address is a 32-bit Internet Protocol version 4 address conventionally written as four decimal components separated by periods.
- How it is used
- Uses IPv4 dotted quads to test whether regular expressions can enforce a bounded numeric format.
- How deep it goes
- Builds a complete range-aware regex from false-positive counterexamples, without exploring IPv4 routing or address allocation.
- Examples
- Tests valid `192.168.20.1` against out-of-range, extra-component, and non-digit inputs, plus AI-generated regexes.
- What you can do after
- Evaluate/understand whether an IPv4 regex rejects malformed quads rather than merely matching dotted digit sequences.
Read how Regular Expression Puzzles and AI Coding Assistants explains IPv4 →
Related concepts
- public ip addressincludes · A public IPv4 address is a globally unique IPv4 network address routable on the public Internet and assigned to an internet-facing resource.
- private ipv4 addressincludes · 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.
- IPv6addressed by · IPv6 is the sixth version of the Internet Protocol, using 128-bit network addresses for packet-based communication.
- regular expressionaddressed by · A formal pattern notation that describes sets of strings and enables text to be matched, searched, extracted, or transformed.
- maximum transmission unituses · The maximum transmission unit is the largest packet size that a network interface or link can transmit without fragmentation.
- octethas part · An octet is a group of exactly eight bits, commonly representing one byte or one component of an IPv4 address.
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