CIDR to IP Range & Host List
CIDR to IP Range & Host List: Enumerates all 8 addresses within the /29 subnet, excluding network (10.0.0.0) and broadcast (10.0.0.7).
About this cidr to ip range & host list
CIDR to IP Range & Host List — browser-based utility.
How this tool works
Validates one IPv4 CIDR and reports its normalized network, broadcast address, and calculated host count. The current implementation does not enumerate individual hosts despite the tool name.
- Binary Bitmask Ingestion: Converts decimal dotted-quad IPv4 strings or hexadecimal colon-separated IPv6 strings into binary bit vectors.
- Bitwise Boolean Algebra: Performs bitwise AND, OR, and NOT operations between IP address integers and CIDR prefix masks.
- Address Class & Scope Tagging: Identifies RFC 1918 private ranges (10.0.0.0/8, 172.16.0.0/12, 192.168.0.0/16), loopback, CGNAT, and multicast blocks.
- Subnet Topology Formatting: Renders network ID, usable host range, broadcast address, binary representation, and Cisco wildcard mask.
Worked example
Scenario: Normalize a small IPv4 CIDR without generating a host list.
Sample input:
Processing: Mask the address to the network boundary, derive its broadcast address, then apply the implementation's host-count rule.
Illustrative output:
Limits and verification
Enforces strict IPv4 prefix boundaries (/0 to /32) and IPv6 boundaries (/0 to /128). In RFC 3021 /31 subnets, correctly reports 2 usable point-to-point hosts without traditional network and broadcast exclusions.
Examples demonstrate an expected workflow; they do not prove every input or every branch of an external specification. Check important results with an independent source before using them for money, security, compliance, safety, or irreversible file changes.
Browser processing boundary
Tool input is processed by code running in the browser and is not intentionally sent to a CZOA processing API. The page can still request ordinary site assets, analytics, or advertising when those services are enabled. Browser extensions and managed-device software remain outside this tool's control.
Relevant references
These references govern or help explain the format, protocol, or calculation used here. Listing a reference does not claim certification or complete implementation of every optional feature.
- RFC 791 (Internet Protocol: IPv4)
- RFC 4632 (Classless Inter-domain Routing: CIDR)
- RFC 4291 (IP Version 6 Addressing Architecture)
Content owner: CZOA Tools · Last reviewed: 2026-09-15 · Review methodology
How to use it
- Enter, paste, or select your input data into the CIDR to IP Range & Host List workspace controls.
- Review available parameter fields, units, formats, or options configured for your task.
- Click the action button or observe immediate live calculations rendered in your browser runtime.
- Inspect the resulting output and any diagnostic messages, then copy or download the result if needed.
Frequently asked questions
What does CIDR Expander actually return?+
It validates one IPv4 CIDR and returns normalized cidr, network address, broadcast address, and a calculated usable-host count. It does not enumerate a host list.
What did the browser vector verify?+
192.0.2.1/30 normalized to 192.0.2.0/30 with network 192.0.2.0, broadcast 192.0.2.3, and hosts 2.
How are /31 and /32 host counts handled?+
The implementation reports 2 hosts for /31 and 1 for /32 rather than applying the ordinary network/broadcast exclusion formula.
Which IPv4 values are rejected?+
Malformed dotted addresses and prefixes outside 0 through 32 raise an error before range calculation.