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Essential for network engineers designing IP addressing schemes. Supports both IPv4 and custom subnet masks.\n\nCalculate\n\nEnter CIDR notation e.g., 192.168.1.0/24\n\n### Add this widget to your website\n\nShow live IP info on any site — free, no sign-up, 2 lines of code.\n\n[Get Free Embed Code →](/ip/widgets/js-embed)\n\n[Checking your IP…](/ip/my-ip-address)\n\n## Related IP Tools\n\n[My IP Address](/ip/my-ip-address) [IP Location](/ip/ip-to-location) [IP to Number](/ip/ip-to-number) [IPv4 to IPv6](/ip/ipv4-to-ipv6-conversion) [DNS Lookup](/ip/dns-lookup)\n\n## Related Products\n\n[📘 Networking Books →](https://www.amazon.com/s?k=networking%20cisco%20book\u0026tag=tejji-20) [🔌 Network Switches →](https://www.amazon.com/s?k=network%20switch%20gigabit\u0026tag=tejji-20) [🔧 Cable Testers →](https://www.amazon.com/s?k=network%20cable%20tester\u0026tag=tejji-20)\n\n*As an Amazon Associate, tejji.com earns from qualifying purchases.*\n\n## Frequently Asked Questions\n\n### What is CIDR notation?\n\nCIDR (Classless Inter-Domain Routing) notation combines an IP address with a prefix length to define a network. For example, 192.168.1.0/24 means the first 24 bits are the network portion, leaving 8 bits for host addresses, which gives 256 total addresses (254 usable).\n\n### What is a subnet mask?\n\nA subnet mask is a 32-bit number that separates the network portion of an IP address from the host portion. For example, 255.255.255.0 (/24) means the first three octets identify the network, and the last octet identifies individual hosts.\n\n### What is the difference between network and broadcast address?\n\nThe network address is the first address in a subnet (all host bits set to 0) and identifies the subnet itself. The broadcast address is the last address (all host bits set to 1) and is used to send data to all hosts in the subnet. Neither can be assigned to individual hosts.\n\n### What is a wildcard mask?\n\nA wildcard mask is the inverse of a subnet mask. Where the subnet mask has 1-bits, the wildcard has 0-bits, and vice versa. For example, if the subnet mask is 255.255.255.0, the wildcard mask is 0.0.0.255. Wildcard masks are commonly used in access control lists (ACLs) on network devices.\n\n### What is the best free subnet calculator in 2025?\n\nThis subnet calculator is one of the best free options available in 2025. Enter any CIDR notation to instantly get network address, broadcast address, subnet mask, wildcard mask, host range, and usable IP count — all without registration or downloads.\n\n### Can I use this subnet calculator on my phone?\n\nYes. This tool is fully responsive and works on any mobile browser. Enter a CIDR notation, tap Calculate, and instantly view all subnet details including network address, broadcast address, and usable host range.\n\n📱\n\nQuick Access\n\nInstall this tool on your device for instant access\n\nInstall App\n\n- IP Tools\n- [My IP Address](/ip/my-ip-address)\n- [IP Location](/ip/ip-to-location)\n- [Bulk IP Lookup](/ip/bulk-ip-lookup)\n- [IP to URL](/ip/ip-address-to-url)\n- [URL to IP](/ip/url-to-ip-address)\n- [IP to Number](/ip/ip-to-number)\n- [IPv4 to IPv6 Converter](/ip/ipv4-to-ipv6-conversion)\n- [IP Server Variables](/ip/ip-server-variables)\n- [DNS Lookup](/ip/dns-lookup)\n- [WHOIS Lookup](/ip/whois-lookup)\n- [IP Blacklist Check](/ip/ip-blacklist-check)\n- [Subnet Calculator](/ip/subnet-calculator)\n- [IP Search](/ip/search)\n\n\u003c!--THE END--\u003e\n\n- IP Widgets\n- [IP Widgets](/ip/widgets)\n- [JS Embed](/ip/widgets/js-embed)\n- [iFrame](/ip/widgets/iframe)\n- [SVG Badge](/ip/widgets/svg-badge)\n- [WordPress](/ip/widgets/wordpress)\n- [Dashboard](/ip/widgets/dashboard)","footer":"\n\n📱 Install Tejji for quick access to this tool Install\n\nTools\n\n- [All Apps](/apps/)\n- [Converters](/convert/)\n- [IP Tools](/ip/)\n- [Calculator](/apps/calculator)\n\nExplore\n\n- [Time \u0026 Date](/time-date/)\n- [Postal Codes](/zip-codes/)\n- [Typing](/typing/)\n- [Extensions](/browser/chrome/extensions/)\n\nCompany\n\n- [About](/home/about)\n- [Contact](/home/contact)\n- [Privacy](/home/privacy)\n- [Terms](/home/terms)\n\nSupport\n\n- [Feedback](/home/contact)\n- [Buy me a coffee](https://buymeacoffee.com/tejji)\n\n© 2026 [Tejji.com](/) — Free online tools for everyone.\n\nWe use cookies for analytics and ads. By clicking \"Accept\", you consent to our use of cookies. [Privacy Policy](/home/privacy)\n\nReject Accept"},"metadata":{"title":"Subnet Calculator – CIDR, Netmask \u0026 IP Range Tool | Tejji","description":"Free online subnet calculator — calculate network address, broadcast, host range, and CIDR notation from any IP and subnet mask. No sign-up required.","imageUrl":"https://tejji.com/page/og-default.png","author":null,"published":null,"modified":null},"rate":{"price":{"priceMicros":0,"currency":""},"license":{"cuid":"","licenseType":"","licensePath":"","permissions":[],"validUntil":""},"error":""}}]