YurlieNetwork & Subnet Tools
9 free utilities for network engineers, DevOps, and cloud architects. Calculate subnets, CIDR blocks, and IP formats in your browser.
CIDR Calculator
Calculate IPv4/IPv6 subnet information from CIDR notation
Subnet Calculator
Split a network into smaller subnets
IP Range Calculator
Convert IP address range to CIDR blocks
IP Calculator
Full IPv4 analysis: class, type, binary breakdown, network & broadcast
Wildcard Mask Calculator
Convert subnet mask to wildcard mask for ACL and firewall rules
IPv4 Converter
Convert IPv4 between decimal, binary, hex, and integer formats
IPv6 Converter
Expand, compress, and convert IPv6 addresses between formats
Subnet Mask Calculator
Convert prefix length to subnet mask, wildcard, and network details
AWS Subnet Calculator
Calculate AWS VPC subnets, usable IPs after 5 reserved IPs, and Multi-AZ VPC plans
About Yurlie Network Engineering Suite
Designing reliable cloud infrastructure and enterprise IP networks requires fast, accurate subnetting calculations. Yurlie provides network engineers, system administrators, and site reliability engineers (SREs) with professional-grade tools that eliminate guesswork when allocating IPv4 and IPv6 address space.
From calculating bitwise netmasks and broadcast boundaries to configuring Cisco ACL wildcard masks and architecting multi-tier AWS Virtual Private Clouds (VPC), all computations execute in local browser memory with instant results and zero network latency.
Frequently Asked Questions
What network tools are available on Yurlie?
Yurlie provides 9 free networking tools: CIDR Calculator (IPv4/IPv6), Subnet Calculator (VLSM network splitting), IP Range Calculator, IP Address Analyzer, IPv4 Converter (binary/hex/integer), IPv6 Converter (expand/compress), Wildcard Mask Calculator, Subnet Mask Reference Table (/0 to /32), and AWS VPC Subnet Calculator.
Are my IP addresses or network ranges logged?
No. All calculations run entirely client-side using JavaScript in your browser. No IP addresses, CIDR blocks, or network topologies are ever transmitted to or logged on our servers.
How does the AWS Subnet Calculator handle reserved IP addresses?
AWS reserves 5 IP addresses in every subnet (the network address, VPC router, Amazon DNS, future reserve, and broadcast address). The Yurlie AWS Subnet Calculator automatically deducts these 5 addresses and outputs exact usable EC2/RDS capacities across Availability Zones.
Are these tools compliant with IETF RFC standards?
Yes. Our calculators strictly comply with RFC 4632 (CIDR), RFC 791 (IPv4), RFC 4291/RFC 5952 (IPv6), and RFC 1918 (Private Address allocation).