🌐 Internet et réseau

📶Bandwidth Calculator Calculate effective bandwidth in Mbps from data transferred and time taken, free online. 📺Bandwidth Needed per User (Streaming & Calls) Calculator Work out the internet speed needed for a number of simultaneous users streaming video, on video calls or browsing, with headroom, free online. ☁️CDN Cost Savings Calculator Estimate monthly CDN cost and savings from caching, free online. 🖧CIDR Range Calculator Find the network, broadcast and usable host range for an IP and prefix, free online. 📤Cloud Egress & CDN Cost Calculator Compare the monthly cost of serving data from a cloud provider with the cost through a CDN, with free allowances, free online. 📊Data Usage Calculator Estimate total monthly data usage from your average daily usage, free online. 🌍DNS TTL Converter Calculator Convert a DNS TTL in seconds to minutes, hours and days, free online. 🏷️Domain Name Total Cost Calculator Calculate the true multi-year cost of a domain name including the cheap first-year promo, renewals, privacy and transfer fees, free online. ⬇️Download Time Calculator Calculate how long a download will take from file size and connection speed, free online. 🌐IP Address Class & Type Calculator Identify an IPv4 address's class (A–E), whether it is private, public, loopback or link-local, and see its binary and integer forms, free online. 🌐IP Address Converter Calculator Convert an IPv4 address to decimal, hexadecimal and binary (or back), free online. 🔎Keyword Density Checker Count how often a keyword or phrase appears in your text and calculate its density percentage for SEO, free online. ⏱️Latency Budget Calculator Add up request latency components against a target budget, free online. 📡Latency to Distance Calculator Estimate the physical distance data travels from network round-trip latency, free online. 🔗Link Speed Throughput Calculator Convert a link speed into data transferred per second, hour, day and month, free online. 📦MTU & MSS Calculator Calculate the TCP maximum segment size (MSS) from the MTU, IP version and tunnel overhead, free online. 📶SLA Uptime & Downtime Calculator Convert an uptime percentage (99.9%, 99.99% …) to allowed downtime per day, month and year — or the reverse — free online. 🔒SSL Expiry Countdown Calculator Count the days until an SSL/TLS certificate expires, free online. 🖧Subnet Calculator Calculate subnet mask, total addresses and usable hosts from a CIDR prefix, free online. 🚦TCP Throughput (Latency & Packet Loss) Calculator Estimate the maximum TCP speed over a connection from its round-trip time, packet loss and window size, free online. 🔗URL & Base64 Encoder / Decoder Calculator Percent-encode or decode text for URLs and convert text to and from Base64, free online. 🛡️VPN Overhead & Effective Throughput Calculator Estimate the packet overhead and expected throughput of WireGuard, OpenVPN or IPsec on top of your line speed, free online. 📄Web Page Weight Calculator Total up a web page's size and estimate its download time, free online. 📡Wi-Fi Signal Strength & Path Loss Calculator Convert a Wi-Fi signal in dBm to a quality rating and estimate the signal at a distance using free-space path loss, free online.