Računalo podneto (IPv4 CIDR)
Polna razčlenitev IPv4 podmrežje: omrežje, oddaja, maska, zaporedna oznaka, razpon gostitelja in število.
Rezultati posodabljajo, ko tipkate.
O tem kalkulatorju
This subnet calculator turns an IPv4 address and a CIDR prefix into the full structure of a subnet. An IPv4 address is 32 bits, usually written as four dot-separated octets like 192.168.1.10, and a CIDR prefix such as /24 splits those 32 bits into a network part (the leading bits, fixed for every host in the subnet) and a host part (the remaining bits, unique to each device). This calculator takes an address and a prefix length and derives the network address, broadcast address, subnet mask, wildcard mask and the range of usable host addresses, along with the IP class and total address count.
The size of a subnet is set by the prefix: a /n block holds 2^(32−n) addresses, of which two are reserved — the network address (all host bits 0, naming the subnet) and the broadcast address (all host bits 1, reaching every host). So a /24 has 2^8 = 256 addresses and 254 usable hosts, a /25 has 128 addresses and 126 usable hosts, and each extra prefix bit halves the block. As a worked example, 192.168.1.10/24 gives a network of 192.168.1.0, a broadcast of 192.168.1.255, a 255.255.255.0 mask, a 0.0.0.255 wildcard mask, and a usable host range of 192.168.1.1 to 192.168.1.254.
Subnetting is how networks are carved into manageable, secure segments — separating departments, sizing VLANs, planning address allocation and writing firewall and routing rules. The wildcard mask (the bitwise inverse of the subnet mask) is what Cisco access-control lists and OSPF use to match ranges of addresses. The /31 and /32 prefixes are special cases: /31 is used for point-to-point links with two usable addresses and no broadcast, and /32 describes a single host.
Pogosta vprašanja
Koliko gostiteljev je v podmreži?
A /n podmete ima 2^ei (32−n) naslove, minus dva rezervirana za omrežje in oddajo. A/24 ima 256 naslovov in 254 uporabnih gostiteljev.
Kaj je maska z zavojčkom?
A wildcard mask is the bitwise inverse of the subnet mask (255.255.255.0 → 0.0.0.255). Access-control lists and OSPF use it to match ranges of addresses.
Kakšna je razlika med omrežjem in naslovom?
Mrežni naslov (vse gostiteljske biti 0) imenuje podmrežje; naslov oddaje (vse bite gostitelja 1) doseže vsakega gostitelja na njem. Tudi napravi ni mogoče dodeliti.
Kaj pomeni predpona CIDR (24,/16)?
To je število vodilnih bitov, ki tvorijo omrežni del naslova. Večji predpona pomeni več omrežnih bitov in manj gostiteljskih bitov, tako manjše podmrežje: /24 daje 254 gostitelja, /25 daje 126, in vsak dodaten bitov polovico bloka.
Kako razdelim omrežje v manjše podmrežje?
Posodite si gostiteljske bite z povečanjem predpona. Razdelitev /24/ na dva /25/25 daje dve bloki 126 gostiteljev; odhod na /26/ daje štiri bloke 62. Vsak dodani predpona bi se podvojilo število podmrež in polovico njihove velikosti.
Kaj je IP naslov razred?
Stara klasična shema razdeli naslove po prvem oktetu: razred A (1–126), razred B (128–191) in razred C (192–223) za enoglasno, plus D za večkratno razporeditev in rezervirano E. CIDR je zamenjal razrede za dodelitev, vendar kalkulator še vedno poroča o razredu naslova.
Za kaj se uporabljata podmetišča/31 in /32?
A /31 has just two addresses and no broadcast, used for point-to-point links between routers. A /32 is a single host address, common for loopbacks and host routes. The calculator handles both special cases.
API – uporabi ta kalkulator iz kode
Poišči ta kalkulator kot brezplačni končni cilj JSON – ni potreben ključ. Pošljite spodnje vrednosti polja kot parametre za poizvedovanje ali JSON. Vse, kar opustite, uporablja enako privzeto. Ta stran je napolnjena z; neznani parameter je 400, nikoli ne tiho ničlo. Preberite celoten API docs →
Končna točka
GET https://calculator.free/api/v1/subnet/curl
curl "https://calculator.free/api/v1/subnet/?ip=192.168.1.10&cidr=24"JavaScript fetch()
const r = await fetch(
"https://calculator.free/api/v1/subnet/?" + new URLSearchParams({
"ip": "192.168.1.10",
"cidr": "24"
}));
const data = await r.json();
console.log(data.results);Rezultati so ocene za splošne smernice, ne pa za finančne, zdravniške ali davčne nasvete.