IPv4 subnet calculator
Calculate the network, broadcast, usable address range and host count from an IPv4 address with a CIDR prefix or subnet mask.
HAR network viewer
Inspect HAR 1.2 requests, timings and headers locally, then export the complete filtered request list as CSV.
Drop one HAR 1.2 file here, up to 20 MiB / 10,000 requests. Files stay on your device; requests and response bodies are never replayed.
Export filtered requests as CSV
About this tool
Review a browser network recording to identify slow requests or inspect recorded response headers.
How to use
Open or drop one HAR 1.2 file. Search URLs, methods or MIME types, filter HTTP statuses and sort by duration, size or status. Select a request to inspect timing phases, request and response headers, and query parameters. The list shows 100 requests per page alongside a capture timeline.
Limits are 20 MiB and 10,000 requests. Files stay local; requests are not replayed and response content is not executed. CSV export includes every filtered request, not just the current page. Missing transfer sizes remain unknown rather than being treated as zero.
Common questions
Does CSV export contain only the current page?
No. It includes every filtered request. The table displays 100 rows per page. HAR input is limited to 20 MiB and 10,000 entries; recorded requests are never replayed.
Why do timing phases add up differently, and why are some sizes blank?
SSL time is already included in connect, so adding both would count it twice. Missing or unknown timing and size values remain unavailable, not zero. Capture duration spans the recording’s earliest request to its latest finish; overlapping requests are not simply added together.
Why is a HAR with readable JSON still rejected?
It must be a valid HAR 1.2 recording, including real calendar dates and timestamps with Z or an explicit offset. February 30 is rejected instead of shifted into March. Re-export the original capture if dates or entry fields were damaged; ordinary JSON is not automatically a HAR.
Are cookies, tokens and request headers removed when I open a HAR?
No. Analysis stays local and does not replay traffic, but recorded headers and query parameters remain visible. The CSV also retains request URLs, which can contain tokens. Review the source recording and export before sharing them with someone else.
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