CIDR calculator

كيفية استخدام CIDR calculator

ما الذي يحسبه ومتى تستخدمه

Works out the المدى وsubnet mask, wildcard mask وsize من a CIDR block مقابل IPv4 أو IPv6 وaccepts an address with a dotted mask, وconverts a start وend address into the smallest list من CIDR blocks that cover them exactly.

طريقة الاستخدام خطوة بخطوة

1. Choose “CIDR block” أو “Address المدى”.
2. Enter a block such as 192.168.10.0/22 وor the first وlast address من a range.
3. Read the first وlast address وmasks وnumber من hosts.
4. For a المدى, نسخ the list من CIDR بلوكات.

معنى كل مُدخل

• CIDR block, أو address with mask – An IPv4 أو IPv6 address followed by /prefix وor an IPv4 address وa dotted mask such as 255.255.252.0.
• First وlast address – The two ends من a range, both IPv4 أو both IPv6.

كيف تقرأ النتائج

• Address المدى – The first وlast address من the block, وthe number من addresses.
• Masks – قناع الشبكة الفرعية وwildcard mask مقابل IPv4.
• Usable hosts – Addresses available مقابل devices: the total minus the network وbroadcast addresses وexcept /31 و/32.
• CIDR بلوكات – For a المدى, the الحد الأدنى set من بلوكات that covers it.

الصيغة

A /n block has 2^(بتّات − n) addresses وwhere bits هو 32 مقابل IPv4 و128 مقابل IPv6. The network address هو the given address with the host bits set to zero. For IPv4 the usable hosts are 2^(32 − n) − 2. IPv6 uses BigInt arithmetic مقابل exact results.

مثال محلول

من 192.168.10.0/22 covers 192.168.8.0 إلى 192.168.11.255 وwhich هو 1,024 addresses و1,022 usable hosts, with mask 255.255.252.0.

الافتراضات والحدود

• Usable hosts follow the usual convention من removing the network وbroadcast addresses. /31 links use both addresses و/32 هو a single host.
• IPv6 بلوكات have لا broadcast address.
• A المدى that does not لائق one block returns several بلوكات.

أخطاء شائعة

• Entering a host address ومن expecting it إلى be the network address. The tool shows the real network address.
• Using a non-contiguous mask such as 255.0.255.0, which هو not valid.
• Mixing an IPv4 first address with an IPv6 last address.

الأسئلة الشائعة

أدوات ذات صلة