CIDR (Classless Inter-Domain Routing) notation appends a prefix length to an IP address, such as 192.168.1.0/24, which indicates the number of bits used for the network portion. From this prefix length you can derive the subnet mask, the network address, the broadcast address, and the total number of usable host addresses in the range. The IP Address Lookup & Analyzer tool accepts any IPv4 or IPv6 address with an optional CIDR prefix and instantly calculates the full subnet details — network range, wildcard mask, first and last usable host — so you can plan IP allocation or verify firewall rules without manual binary math.

Private IP addresses are reserved ranges defined by RFC 1918 (for IPv4: 10.0.0.0/8, 172.16.0.0/12, and 192.168.0.0/16) that are used within local networks and are not routable on the public internet. Public IP addresses are globally unique and reachable from anywhere on the internet. Knowing whether an address is private or public is essential for network diagnostics, configuring NAT rules, setting up VPNs, and auditing security policies. The IP Address Lookup & Analyzer tool automatically classifies any entered address as private, public, loopback, link-local, or multicast, helping you quickly verify network configurations.

Computing the precise duration between two points in time requires handling varying month lengths, leap years, timezone offsets, and daylight saving transitions. The Timestamp Diff Calculator lets you enter two dates, datetimes, or Unix timestamps and instantly shows the difference broken down into years, months, days, hours, minutes, and seconds, as well as total days, total hours, and total seconds. This is useful for calculating SLA durations, measuring deployment intervals, determining age from a birthdate, computing elapsed time between log entries, or planning project timelines — all calculated in the browser with no data sent to any server.

Network & Time Tools