Host portion
The host portion is the part of an IP address that identifies an individual interface or address within a network prefix.
Acing the CCNA Exam: Volume 1 Fundamentals and Protocols
A host bit is an IPv4 address bit belonging to the host portion rather than the network portion.
- How it is used
- Explains how IPv4 addresses identify hosts within shared LAN networks.
- How deep it goes
- Explains prefix lengths, netmasks, boundary values, capacity formulas, and subnetting, stopping short of detailed protocol internals.
- Examples
- Uses 192.168.100.0/24, 10.89.100.0/25, and host requirements of 122 and 59 addresses.
- What you can do after
- Apply prefix lengths and host-bit formulas to identify network boundaries, usable ranges, broadcasts, and suitable subnet sizes.
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Google Anthos in Action
Host bits are the portion of an IP address that identifies individual addresses within a network prefix.
- How it is used
- Sizes GKE node and Pod address ranges before cluster deployment.
- How deep it goes
- Calculates host bits through capacity tables and a CIDR formula, stopping short of general subnetting theory.
- Examples
- Uses node and Pod capacity tables plus a 5,000-node, 110-Pod-per-node calculation producing a /11 Pod CIDR.
- What you can do after
- Apply host-bit tables and the CIDR formula to size GKE node and Pod address ranges.
Related concepts
- borrowed bithas part · A borrowed bit is a host bit reassigned to the network portion of an IPv4 address during subnetting.
- subnettingused by · Subnetting is the division of an IP address space into smaller logical networks by extending the network prefix.
- ipv4 networkpart of · An IPv4 network is a logical network defined by an IPv4 network address and prefix length, containing a set of IPv4 addresses.
- IP addresspart of · An IP address is a numerical address used by the Internet Protocol to identify a network interface and support packet delivery across networks.
- network portioncontrasts with · The network portion is the part of an IP address, determined by its prefix or subnet mask, that identifies the network or subnet containing the addressed host.
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