Network & Time Tools

Analyze IP addresses, calculate subnets, and compare timestamps with these free browser-based network and time utilities. Look up and validate IPv4 and IPv6 addresses, compute subnet masks and CIDR ranges, classify private versus public IP addresses for network diagnostics, and calculate the exact difference between two timestamps or dates in years, months, days, hours, minutes, and seconds. Whether you’re troubleshooting network configurations, planning IP address allocation, or measuring time durations between events — all tools run entirely client-side with no server calls and no signup required.

4 Network & Time Tools

IP Address Lookup & Analyzer

Validate IPs, calculate subnets, classify private/public ranges. IPv4 and IPv6.

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Timestamp Diff Calculator

Calculate exact difference between two timestamps or dates in multiple units.

DNS

DNS Lookup Tool

Query A, AAAA, CNAME, MX, TXT, NS records via DoH.

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Relative Time Calculator

Convert timestamps to "3 days ago", "in 2 hours".

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Which network & time tool should you use?

Network tools answer the everyday questions that come up when wiring up infrastructure: is this IP private or public, what's in this subnet, what records does this domain have, how long ago was that timestamp. All four run client-side; DNS lookups go straight to Cloudflare's DoH endpoint without any server intermediary.

Check if an IP is public/private/reserved, calculate subnet, find host range from CIDR notation — use IP Address Lookup.
Look up DNS records (A, AAAA, MX, TXT, NS, CNAME, SOA, CAA) for any domain via DNS-over-HTTPS — use DNS Lookup Tool.
Calculate the difference between two timestamps or dates in days, hours, minutes — use Timestamp Diff Calculator.
Convert a timestamp into "3 days ago" / "in 2 hours" human-readable form — use Relative Time Calculator.

Common network & time mistakes to avoid

Confusing /24 with 24 hosts. A /24 subnet has 256 addresses (254 usable). Higher number = smaller subnet. The slash counts network bits, not hosts.
Treating 10.0.0.0/8, 172.16/12, 192.168/16 as routable. Those are RFC 1918 private ranges — never reachable from the public internet. Common cause of "works locally, broken in prod" deploys.
Looking up DNS through your local resolver during deploys. Your local cache may be stale. Use a DoH endpoint or dig +trace to bypass caches.
Comparing timestamps in different timezones as if they were equal. Always normalize to UTC for storage; render to local time only for display. Saved many a billing-cycle bug.
Using Date.now() in milliseconds with code expecting seconds (or vice versa). JS uses ms, most Unix tools and PostgreSQL use seconds. Off by 1000× is a fun outage.
Trusting "leap seconds don't matter." They do — for sub-second-precision systems (HFT, GPS, time-series DBs). Use TAI or monotonic clocks where it counts.

Frequently Asked Questions

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.

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