CIDR calculator
CIDR calculator voor IPv4 en IPv6: network range, subnet mask, wildcard mask, host Aantal, en conversion a start en end address tot CIDR blocks.
Over CIDR calculator
CIDR calculator voor IPv4 en IPv6: network range, subnet mask, wildcard mask, host Aantal, en conversion a start en end address tot CIDR blocks.
Onderdeel van de sectie “Data en netwerken” van SmartCalcy. Werkt in je browser zonder account, gebruikt je eigen valuta en eenheden (te wijzigen bovenaan de pagina) en geeft schattingen alleen ter informatie, dus controleer officiële richtlijnen voordat je op een resultaat vertrouwt.
Zo gebruik je de CIDR calculator
Wat het berekent en wanneer je het gebruikt
Works out the Bereik, subnet mask, wildcard mask en size a CIDR block voor IPv4 of IPv6, accepts an address with a dotted mask, en converts a start en end address into the smallest list CIDR blocks that cover them exactly.
Zo gebruik je het, stap voor stap
- Choose “CIDR block” of “Address Bereik”.
- Enter a block such as 192.168.10.0/22, or the first en last address a range.
- Read the first en last address, masks en number hosts.
- For a Bereik, Kopiëren the list CIDR blokken.
Wat elk invoerveld betekent
- CIDR block, of address with mask – An IPv4 of IPv6 address followed by /prefix, or an IPv4 address en a dotted mask such as 255.255.252.0.
- First en last address – The two eindigt a range, both IPv4 of both IPv6.
Zo lees je de resultaten
- Address Bereik – The first en last address the block, en the number addresses.
- Masks – Subnetmasker en wildcard mask voor IPv4.
- Usable hosts – Addresses available voor devices: the total minus the network en broadcast addresses, except /31 en /32.
- CIDR blokken – For a Bereik, the minimum set blokken that covers it.
De formule
A /n block has 2^(bits − n) addresses, where bits is 32 voor IPv4 en 128 voor IPv6. The network address is the given address with the host bits set tot zero. For IPv4 the usable hosts are 2^(32 − n) − 2. IPv6 uses BigInt arithmetic voor exact results.
Een rekenvoorbeeld
192.168.10.0/22 covers 192.168.8.0 tot 192.168.11.255, which is 1,024 addresses en 1,022 usable hosts, with mask 255.255.252.0.
Aannames en beperkingen
- Usable hosts follow the usual convention removing the network en broadcast addresses. /31 links use both addresses en /32 is a single host.
- IPv6 blokken have Nee broadcast address.
- A Bereik that does not fit one block returns several blokken.
Veelgemaakte fouten
- Entering a host address en expecting it tot be the network address. The tool shows the real network address.
- Using a non-contiguous mask such as 255.0.255.0, which is not valid.
- Mixing an IPv4 first address with an IPv6 last address.
Veelgestelde vragen
What is CIDR notation?
A way writing an address range as an address en a prefix length, such as 10.0.0.0/8, where the prefix is the number fixed leading bits.
How many hosts are in a /24?
256 addresses en 254 bruikbare hosts.
What is a wildcard mask?
The inverse the subnet mask, used in access lists. For 255.255.255.0 it is 0.0.0.255.
What is a /64 in IPv6?
The standard Grootte one IPv6 subnet, with 2^64 addresses.
Blik a Bereik always be one block?
Only if it begint on a boundary en its size is a power two. Otherwise it is split into several blocks.
Gerelateerde tools
Block details
- Netwerkadres
- 192.168.8.0
- Subnetmasker
- 255.255.252.0
- Wildcardmasker
- 0.0.3.255
- Eerste bruikbare host
- 192.168.8.1
- Laatste bruikbare host
- 192.168.11.254
- Broadcastadres
- 192.168.11.255
- Totaal aantal adressen
- 1,024
- Usable hosts
- 1,022
- Prefix lenge
- /22
- Mask in Binair
- 11111111.11111111.11111100.00000000