Free Tools

IPv4 network, broadcast and usable range from any IP and CIDR prefix, with a splitter for planning VPC subnets.

Convert data sizes and link speeds, and estimate how long a transfer really takes with protocol overhead.

A concrete migration timeline: when to lower the TTL, when the switch fully propagates, and when to restore it.

Paste a zone file and see what a migration would break: missing SPF, DKIM or DMARC, mail hosts that must stay unproxied, and TTLs still too long.

Searchable reference of the TCP and UDP ports engineers actually meet, with security notes.

Turn availability targets into allowed downtime, combine the SLAs of a dependency chain, and track an error budget.

Paste response-time samples and get P50 through P99.9 with min, mean, max and a long-tail warning.

Solve concurrency, throughput and latency from the other two, and convert request rates across time windows.

The full exponential backoff schedule with jitter, checked against your caller timeout, plus the load retries add to a failing dependency.

Price an outage, and see what the downtime each availability tier allows is worth per month, quarter or year.

Split an end to end response time target across components, see what is left, and check the round trip floor distance imposes.

See the QoS class the kubelet will assign from your requests and limits, with eviction and overcommit warnings.

Compare cities side by side and find an hour that works for everyone, with daylight saving handled for any date.

Decode a raw value from Chrome History or Cookies, plus Cocoa NSDate and Mac HFS+, with every plausible reading shown rather than one guess.

Active Directory and Windows FILETIME values to a date, including the zero and Int64 max sentinels and the negative maxPwdAge durations.

Unix timestamps to dates and back, with seconds, milliseconds, microseconds or nanoseconds detected automatically.

Strong random passwords and memorable passphrases, with entropy and crack time shown for every result.

Generate v4, v7, v1 and nil UUIDs in bulk, with formatting options and no ad wall on click.

Turn any link into a QR code and download it as PNG or SVG. The link is encoded directly, with no tracking redirect.