IPv4 Subnet Calculator

Enter an IP with a CIDR prefix or a subnet mask to see its network, broadcast, host range, and host count. You can also split the network into smaller subnets.

Try:192.168.1.10/24 10.0.0.0/8 172.16.5.4/20 203.0.113.9/29

IPv6 calculator →

private IP (RFC 1918)10.42.0.0/15

network10.42.0.0/15

broadcast10.43.255.255

first host10.42.0.1

last host10.43.255.254

subnet mask255.254.0.0

wildcard0.1.255.255

addresses131,072

usable hosts131,070

classA

ipcalc 10.42.0.0/15

address00001010.00101010.00000000.00000000

subnet mask11111111.11111110.00000000.00000000

network00001010.00101010.00000000.00000000

broadcast00001010.00101011.11111111.11111111

green = network part, grey = host part

hex0x0a2a0000

decimal170524672

reverse dns0.0.42.10.in-addr.arpa

ipv4-mapped::ffff:a2a:0

/15 split into /23 · 256 subnets

close ×

#	network	host range	broadcast
1	10.42.0.0/23	10.42.0.1 – 10.42.1.254	10.42.1.255
2	10.42.2.0/23	10.42.2.1 – 10.42.3.254	10.42.3.255
3	10.42.4.0/23	10.42.4.1 – 10.42.5.254	10.42.5.255
4	10.42.6.0/23	10.42.6.1 – 10.42.7.254	10.42.7.255
5	10.42.8.0/23	10.42.8.1 – 10.42.9.254	10.42.9.255
6	10.42.10.0/23	10.42.10.1 – 10.42.11.254	10.42.11.255
7	10.42.12.0/23	10.42.12.1 – 10.42.13.254	10.42.13.255
8	10.42.14.0/23	10.42.14.1 – 10.42.15.254	10.42.15.255
9	10.42.16.0/23	10.42.16.1 – 10.42.17.254	10.42.17.255
10	10.42.18.0/23	10.42.18.1 – 10.42.19.254	10.42.19.255
11	10.42.20.0/23	10.42.20.1 – 10.42.21.254	10.42.21.255
12	10.42.22.0/23	10.42.22.1 – 10.42.23.254	10.42.23.255
13	10.42.24.0/23	10.42.24.1 – 10.42.25.254	10.42.25.255
14	10.42.26.0/23	10.42.26.1 – 10.42.27.254	10.42.27.255
15	10.42.28.0/23	10.42.28.1 – 10.42.29.254	10.42.29.255
16	10.42.30.0/23	10.42.30.1 – 10.42.31.254	10.42.31.255
17	10.42.32.0/23	10.42.32.1 – 10.42.33.254	10.42.33.255
18	10.42.34.0/23	10.42.34.1 – 10.42.35.254	10.42.35.255
19	10.42.36.0/23	10.42.36.1 – 10.42.37.254	10.42.37.255
20	10.42.38.0/23	10.42.38.1 – 10.42.39.254	10.42.39.255
21	10.42.40.0/23	10.42.40.1 – 10.42.41.254	10.42.41.255
22	10.42.42.0/23	10.42.42.1 – 10.42.43.254	10.42.43.255
23	10.42.44.0/23	10.42.44.1 – 10.42.45.254	10.42.45.255
24	10.42.46.0/23	10.42.46.1 – 10.42.47.254	10.42.47.255
25	10.42.48.0/23	10.42.48.1 – 10.42.49.254	10.42.49.255
26	10.42.50.0/23	10.42.50.1 – 10.42.51.254	10.42.51.255
27	10.42.52.0/23	10.42.52.1 – 10.42.53.254	10.42.53.255
28	10.42.54.0/23	10.42.54.1 – 10.42.55.254	10.42.55.255
29	10.42.56.0/23	10.42.56.1 – 10.42.57.254	10.42.57.255
30	10.42.58.0/23	10.42.58.1 – 10.42.59.254	10.42.59.255
31	10.42.60.0/23	10.42.60.1 – 10.42.61.254	10.42.61.255
32	10.42.62.0/23	10.42.62.1 – 10.42.63.254	10.42.63.255
33	10.42.64.0/23	10.42.64.1 – 10.42.65.254	10.42.65.255
34	10.42.66.0/23	10.42.66.1 – 10.42.67.254	10.42.67.255
35	10.42.68.0/23	10.42.68.1 – 10.42.69.254	10.42.69.255
36	10.42.70.0/23	10.42.70.1 – 10.42.71.254	10.42.71.255
37	10.42.72.0/23	10.42.72.1 – 10.42.73.254	10.42.73.255
38	10.42.74.0/23	10.42.74.1 – 10.42.75.254	10.42.75.255
39	10.42.76.0/23	10.42.76.1 – 10.42.77.254	10.42.77.255
40	10.42.78.0/23	10.42.78.1 – 10.42.79.254	10.42.79.255
41	10.42.80.0/23	10.42.80.1 – 10.42.81.254	10.42.81.255
42	10.42.82.0/23	10.42.82.1 – 10.42.83.254	10.42.83.255
43	10.42.84.0/23	10.42.84.1 – 10.42.85.254	10.42.85.255
44	10.42.86.0/23	10.42.86.1 – 10.42.87.254	10.42.87.255
45	10.42.88.0/23	10.42.88.1 – 10.42.89.254	10.42.89.255
46	10.42.90.0/23	10.42.90.1 – 10.42.91.254	10.42.91.255
47	10.42.92.0/23	10.42.92.1 – 10.42.93.254	10.42.93.255
48	10.42.94.0/23	10.42.94.1 – 10.42.95.254	10.42.95.255
49	10.42.96.0/23	10.42.96.1 – 10.42.97.254	10.42.97.255
50	10.42.98.0/23	10.42.98.1 – 10.42.99.254	10.42.99.255
51	10.42.100.0/23	10.42.100.1 – 10.42.101.254	10.42.101.255
52	10.42.102.0/23	10.42.102.1 – 10.42.103.254	10.42.103.255
53	10.42.104.0/23	10.42.104.1 – 10.42.105.254	10.42.105.255
54	10.42.106.0/23	10.42.106.1 – 10.42.107.254	10.42.107.255
55	10.42.108.0/23	10.42.108.1 – 10.42.109.254	10.42.109.255
56	10.42.110.0/23	10.42.110.1 – 10.42.111.254	10.42.111.255
57	10.42.112.0/23	10.42.112.1 – 10.42.113.254	10.42.113.255
58	10.42.114.0/23	10.42.114.1 – 10.42.115.254	10.42.115.255
59	10.42.116.0/23	10.42.116.1 – 10.42.117.254	10.42.117.255
60	10.42.118.0/23	10.42.118.1 – 10.42.119.254	10.42.119.255
61	10.42.120.0/23	10.42.120.1 – 10.42.121.254	10.42.121.255
62	10.42.122.0/23	10.42.122.1 – 10.42.123.254	10.42.123.255
63	10.42.124.0/23	10.42.124.1 – 10.42.125.254	10.42.125.255
64	10.42.126.0/23	10.42.126.1 – 10.42.127.254	10.42.127.255
65	10.42.128.0/23	10.42.128.1 – 10.42.129.254	10.42.129.255
66	10.42.130.0/23	10.42.130.1 – 10.42.131.254	10.42.131.255
67	10.42.132.0/23	10.42.132.1 – 10.42.133.254	10.42.133.255
68	10.42.134.0/23	10.42.134.1 – 10.42.135.254	10.42.135.255
69	10.42.136.0/23	10.42.136.1 – 10.42.137.254	10.42.137.255
70	10.42.138.0/23	10.42.138.1 – 10.42.139.254	10.42.139.255
71	10.42.140.0/23	10.42.140.1 – 10.42.141.254	10.42.141.255
72	10.42.142.0/23	10.42.142.1 – 10.42.143.254	10.42.143.255
73	10.42.144.0/23	10.42.144.1 – 10.42.145.254	10.42.145.255
74	10.42.146.0/23	10.42.146.1 – 10.42.147.254	10.42.147.255
75	10.42.148.0/23	10.42.148.1 – 10.42.149.254	10.42.149.255
76	10.42.150.0/23	10.42.150.1 – 10.42.151.254	10.42.151.255
77	10.42.152.0/23	10.42.152.1 – 10.42.153.254	10.42.153.255
78	10.42.154.0/23	10.42.154.1 – 10.42.155.254	10.42.155.255
79	10.42.156.0/23	10.42.156.1 – 10.42.157.254	10.42.157.255
80	10.42.158.0/23	10.42.158.1 – 10.42.159.254	10.42.159.255
81	10.42.160.0/23	10.42.160.1 – 10.42.161.254	10.42.161.255
82	10.42.162.0/23	10.42.162.1 – 10.42.163.254	10.42.163.255
83	10.42.164.0/23	10.42.164.1 – 10.42.165.254	10.42.165.255
84	10.42.166.0/23	10.42.166.1 – 10.42.167.254	10.42.167.255
85	10.42.168.0/23	10.42.168.1 – 10.42.169.254	10.42.169.255
86	10.42.170.0/23	10.42.170.1 – 10.42.171.254	10.42.171.255
87	10.42.172.0/23	10.42.172.1 – 10.42.173.254	10.42.173.255
88	10.42.174.0/23	10.42.174.1 – 10.42.175.254	10.42.175.255
89	10.42.176.0/23	10.42.176.1 – 10.42.177.254	10.42.177.255
90	10.42.178.0/23	10.42.178.1 – 10.42.179.254	10.42.179.255
91	10.42.180.0/23	10.42.180.1 – 10.42.181.254	10.42.181.255
92	10.42.182.0/23	10.42.182.1 – 10.42.183.254	10.42.183.255
93	10.42.184.0/23	10.42.184.1 – 10.42.185.254	10.42.185.255
94	10.42.186.0/23	10.42.186.1 – 10.42.187.254	10.42.187.255
95	10.42.188.0/23	10.42.188.1 – 10.42.189.254	10.42.189.255
96	10.42.190.0/23	10.42.190.1 – 10.42.191.254	10.42.191.255
97	10.42.192.0/23	10.42.192.1 – 10.42.193.254	10.42.193.255
98	10.42.194.0/23	10.42.194.1 – 10.42.195.254	10.42.195.255
99	10.42.196.0/23	10.42.196.1 – 10.42.197.254	10.42.197.255
100	10.42.198.0/23	10.42.198.1 – 10.42.199.254	10.42.199.255
101	10.42.200.0/23	10.42.200.1 – 10.42.201.254	10.42.201.255
102	10.42.202.0/23	10.42.202.1 – 10.42.203.254	10.42.203.255
103	10.42.204.0/23	10.42.204.1 – 10.42.205.254	10.42.205.255
104	10.42.206.0/23	10.42.206.1 – 10.42.207.254	10.42.207.255
105	10.42.208.0/23	10.42.208.1 – 10.42.209.254	10.42.209.255
106	10.42.210.0/23	10.42.210.1 – 10.42.211.254	10.42.211.255
107	10.42.212.0/23	10.42.212.1 – 10.42.213.254	10.42.213.255
108	10.42.214.0/23	10.42.214.1 – 10.42.215.254	10.42.215.255
109	10.42.216.0/23	10.42.216.1 – 10.42.217.254	10.42.217.255
110	10.42.218.0/23	10.42.218.1 – 10.42.219.254	10.42.219.255
111	10.42.220.0/23	10.42.220.1 – 10.42.221.254	10.42.221.255
112	10.42.222.0/23	10.42.222.1 – 10.42.223.254	10.42.223.255
113	10.42.224.0/23	10.42.224.1 – 10.42.225.254	10.42.225.255
114	10.42.226.0/23	10.42.226.1 – 10.42.227.254	10.42.227.255
115	10.42.228.0/23	10.42.228.1 – 10.42.229.254	10.42.229.255
116	10.42.230.0/23	10.42.230.1 – 10.42.231.254	10.42.231.255
117	10.42.232.0/23	10.42.232.1 – 10.42.233.254	10.42.233.255
118	10.42.234.0/23	10.42.234.1 – 10.42.235.254	10.42.235.255
119	10.42.236.0/23	10.42.236.1 – 10.42.237.254	10.42.237.255
120	10.42.238.0/23	10.42.238.1 – 10.42.239.254	10.42.239.255
121	10.42.240.0/23	10.42.240.1 – 10.42.241.254	10.42.241.255
122	10.42.242.0/23	10.42.242.1 – 10.42.243.254	10.42.243.255
123	10.42.244.0/23	10.42.244.1 – 10.42.245.254	10.42.245.255
124	10.42.246.0/23	10.42.246.1 – 10.42.247.254	10.42.247.255
125	10.42.248.0/23	10.42.248.1 – 10.42.249.254	10.42.249.255
126	10.42.250.0/23	10.42.250.1 – 10.42.251.254	10.42.251.255
127	10.42.252.0/23	10.42.252.1 – 10.42.253.254	10.42.253.255
128	10.42.254.0/23	10.42.254.1 – 10.42.255.254	10.42.255.255
129	10.43.0.0/23	10.43.0.1 – 10.43.1.254	10.43.1.255
130	10.43.2.0/23	10.43.2.1 – 10.43.3.254	10.43.3.255
131	10.43.4.0/23	10.43.4.1 – 10.43.5.254	10.43.5.255
132	10.43.6.0/23	10.43.6.1 – 10.43.7.254	10.43.7.255
133	10.43.8.0/23	10.43.8.1 – 10.43.9.254	10.43.9.255
134	10.43.10.0/23	10.43.10.1 – 10.43.11.254	10.43.11.255
135	10.43.12.0/23	10.43.12.1 – 10.43.13.254	10.43.13.255
136	10.43.14.0/23	10.43.14.1 – 10.43.15.254	10.43.15.255
137	10.43.16.0/23	10.43.16.1 – 10.43.17.254	10.43.17.255
138	10.43.18.0/23	10.43.18.1 – 10.43.19.254	10.43.19.255
139	10.43.20.0/23	10.43.20.1 – 10.43.21.254	10.43.21.255
140	10.43.22.0/23	10.43.22.1 – 10.43.23.254	10.43.23.255
141	10.43.24.0/23	10.43.24.1 – 10.43.25.254	10.43.25.255
142	10.43.26.0/23	10.43.26.1 – 10.43.27.254	10.43.27.255
143	10.43.28.0/23	10.43.28.1 – 10.43.29.254	10.43.29.255
144	10.43.30.0/23	10.43.30.1 – 10.43.31.254	10.43.31.255
145	10.43.32.0/23	10.43.32.1 – 10.43.33.254	10.43.33.255
146	10.43.34.0/23	10.43.34.1 – 10.43.35.254	10.43.35.255
147	10.43.36.0/23	10.43.36.1 – 10.43.37.254	10.43.37.255
148	10.43.38.0/23	10.43.38.1 – 10.43.39.254	10.43.39.255
149	10.43.40.0/23	10.43.40.1 – 10.43.41.254	10.43.41.255
150	10.43.42.0/23	10.43.42.1 – 10.43.43.254	10.43.43.255
151	10.43.44.0/23	10.43.44.1 – 10.43.45.254	10.43.45.255
152	10.43.46.0/23	10.43.46.1 – 10.43.47.254	10.43.47.255
153	10.43.48.0/23	10.43.48.1 – 10.43.49.254	10.43.49.255
154	10.43.50.0/23	10.43.50.1 – 10.43.51.254	10.43.51.255
155	10.43.52.0/23	10.43.52.1 – 10.43.53.254	10.43.53.255
156	10.43.54.0/23	10.43.54.1 – 10.43.55.254	10.43.55.255
157	10.43.56.0/23	10.43.56.1 – 10.43.57.254	10.43.57.255
158	10.43.58.0/23	10.43.58.1 – 10.43.59.254	10.43.59.255
159	10.43.60.0/23	10.43.60.1 – 10.43.61.254	10.43.61.255
160	10.43.62.0/23	10.43.62.1 – 10.43.63.254	10.43.63.255
161	10.43.64.0/23	10.43.64.1 – 10.43.65.254	10.43.65.255
162	10.43.66.0/23	10.43.66.1 – 10.43.67.254	10.43.67.255
163	10.43.68.0/23	10.43.68.1 – 10.43.69.254	10.43.69.255
164	10.43.70.0/23	10.43.70.1 – 10.43.71.254	10.43.71.255
165	10.43.72.0/23	10.43.72.1 – 10.43.73.254	10.43.73.255
166	10.43.74.0/23	10.43.74.1 – 10.43.75.254	10.43.75.255
167	10.43.76.0/23	10.43.76.1 – 10.43.77.254	10.43.77.255
168	10.43.78.0/23	10.43.78.1 – 10.43.79.254	10.43.79.255
169	10.43.80.0/23	10.43.80.1 – 10.43.81.254	10.43.81.255
170	10.43.82.0/23	10.43.82.1 – 10.43.83.254	10.43.83.255
171	10.43.84.0/23	10.43.84.1 – 10.43.85.254	10.43.85.255
172	10.43.86.0/23	10.43.86.1 – 10.43.87.254	10.43.87.255
173	10.43.88.0/23	10.43.88.1 – 10.43.89.254	10.43.89.255
174	10.43.90.0/23	10.43.90.1 – 10.43.91.254	10.43.91.255
175	10.43.92.0/23	10.43.92.1 – 10.43.93.254	10.43.93.255
176	10.43.94.0/23	10.43.94.1 – 10.43.95.254	10.43.95.255
177	10.43.96.0/23	10.43.96.1 – 10.43.97.254	10.43.97.255
178	10.43.98.0/23	10.43.98.1 – 10.43.99.254	10.43.99.255
179	10.43.100.0/23	10.43.100.1 – 10.43.101.254	10.43.101.255
180	10.43.102.0/23	10.43.102.1 – 10.43.103.254	10.43.103.255
181	10.43.104.0/23	10.43.104.1 – 10.43.105.254	10.43.105.255
182	10.43.106.0/23	10.43.106.1 – 10.43.107.254	10.43.107.255
183	10.43.108.0/23	10.43.108.1 – 10.43.109.254	10.43.109.255
184	10.43.110.0/23	10.43.110.1 – 10.43.111.254	10.43.111.255
185	10.43.112.0/23	10.43.112.1 – 10.43.113.254	10.43.113.255
186	10.43.114.0/23	10.43.114.1 – 10.43.115.254	10.43.115.255
187	10.43.116.0/23	10.43.116.1 – 10.43.117.254	10.43.117.255
188	10.43.118.0/23	10.43.118.1 – 10.43.119.254	10.43.119.255
189	10.43.120.0/23	10.43.120.1 – 10.43.121.254	10.43.121.255
190	10.43.122.0/23	10.43.122.1 – 10.43.123.254	10.43.123.255
191	10.43.124.0/23	10.43.124.1 – 10.43.125.254	10.43.125.255
192	10.43.126.0/23	10.43.126.1 – 10.43.127.254	10.43.127.255
193	10.43.128.0/23	10.43.128.1 – 10.43.129.254	10.43.129.255
194	10.43.130.0/23	10.43.130.1 – 10.43.131.254	10.43.131.255
195	10.43.132.0/23	10.43.132.1 – 10.43.133.254	10.43.133.255
196	10.43.134.0/23	10.43.134.1 – 10.43.135.254	10.43.135.255
197	10.43.136.0/23	10.43.136.1 – 10.43.137.254	10.43.137.255
198	10.43.138.0/23	10.43.138.1 – 10.43.139.254	10.43.139.255
199	10.43.140.0/23	10.43.140.1 – 10.43.141.254	10.43.141.255
200	10.43.142.0/23	10.43.142.1 – 10.43.143.254	10.43.143.255
201	10.43.144.0/23	10.43.144.1 – 10.43.145.254	10.43.145.255
202	10.43.146.0/23	10.43.146.1 – 10.43.147.254	10.43.147.255
203	10.43.148.0/23	10.43.148.1 – 10.43.149.254	10.43.149.255
204	10.43.150.0/23	10.43.150.1 – 10.43.151.254	10.43.151.255
205	10.43.152.0/23	10.43.152.1 – 10.43.153.254	10.43.153.255
206	10.43.154.0/23	10.43.154.1 – 10.43.155.254	10.43.155.255
207	10.43.156.0/23	10.43.156.1 – 10.43.157.254	10.43.157.255
208	10.43.158.0/23	10.43.158.1 – 10.43.159.254	10.43.159.255
209	10.43.160.0/23	10.43.160.1 – 10.43.161.254	10.43.161.255
210	10.43.162.0/23	10.43.162.1 – 10.43.163.254	10.43.163.255
211	10.43.164.0/23	10.43.164.1 – 10.43.165.254	10.43.165.255
212	10.43.166.0/23	10.43.166.1 – 10.43.167.254	10.43.167.255
213	10.43.168.0/23	10.43.168.1 – 10.43.169.254	10.43.169.255
214	10.43.170.0/23	10.43.170.1 – 10.43.171.254	10.43.171.255
215	10.43.172.0/23	10.43.172.1 – 10.43.173.254	10.43.173.255
216	10.43.174.0/23	10.43.174.1 – 10.43.175.254	10.43.175.255
217	10.43.176.0/23	10.43.176.1 – 10.43.177.254	10.43.177.255
218	10.43.178.0/23	10.43.178.1 – 10.43.179.254	10.43.179.255
219	10.43.180.0/23	10.43.180.1 – 10.43.181.254	10.43.181.255
220	10.43.182.0/23	10.43.182.1 – 10.43.183.254	10.43.183.255
221	10.43.184.0/23	10.43.184.1 – 10.43.185.254	10.43.185.255
222	10.43.186.0/23	10.43.186.1 – 10.43.187.254	10.43.187.255
223	10.43.188.0/23	10.43.188.1 – 10.43.189.254	10.43.189.255
224	10.43.190.0/23	10.43.190.1 – 10.43.191.254	10.43.191.255
225	10.43.192.0/23	10.43.192.1 – 10.43.193.254	10.43.193.255
226	10.43.194.0/23	10.43.194.1 – 10.43.195.254	10.43.195.255
227	10.43.196.0/23	10.43.196.1 – 10.43.197.254	10.43.197.255
228	10.43.198.0/23	10.43.198.1 – 10.43.199.254	10.43.199.255
229	10.43.200.0/23	10.43.200.1 – 10.43.201.254	10.43.201.255
230	10.43.202.0/23	10.43.202.1 – 10.43.203.254	10.43.203.255
231	10.43.204.0/23	10.43.204.1 – 10.43.205.254	10.43.205.255
232	10.43.206.0/23	10.43.206.1 – 10.43.207.254	10.43.207.255
233	10.43.208.0/23	10.43.208.1 – 10.43.209.254	10.43.209.255
234	10.43.210.0/23	10.43.210.1 – 10.43.211.254	10.43.211.255
235	10.43.212.0/23	10.43.212.1 – 10.43.213.254	10.43.213.255
236	10.43.214.0/23	10.43.214.1 – 10.43.215.254	10.43.215.255
237	10.43.216.0/23	10.43.216.1 – 10.43.217.254	10.43.217.255
238	10.43.218.0/23	10.43.218.1 – 10.43.219.254	10.43.219.255
239	10.43.220.0/23	10.43.220.1 – 10.43.221.254	10.43.221.255
240	10.43.222.0/23	10.43.222.1 – 10.43.223.254	10.43.223.255
241	10.43.224.0/23	10.43.224.1 – 10.43.225.254	10.43.225.255
242	10.43.226.0/23	10.43.226.1 – 10.43.227.254	10.43.227.255
243	10.43.228.0/23	10.43.228.1 – 10.43.229.254	10.43.229.255
244	10.43.230.0/23	10.43.230.1 – 10.43.231.254	10.43.231.255
245	10.43.232.0/23	10.43.232.1 – 10.43.233.254	10.43.233.255
246	10.43.234.0/23	10.43.234.1 – 10.43.235.254	10.43.235.255
247	10.43.236.0/23	10.43.236.1 – 10.43.237.254	10.43.237.255
248	10.43.238.0/23	10.43.238.1 – 10.43.239.254	10.43.239.255
249	10.43.240.0/23	10.43.240.1 – 10.43.241.254	10.43.241.255
250	10.43.242.0/23	10.43.242.1 – 10.43.243.254	10.43.243.255
251	10.43.244.0/23	10.43.244.1 – 10.43.245.254	10.43.245.255
252	10.43.246.0/23	10.43.246.1 – 10.43.247.254	10.43.247.255
253	10.43.248.0/23	10.43.248.1 – 10.43.249.254	10.43.249.255
254	10.43.250.0/23	10.43.250.1 – 10.43.251.254	10.43.251.255
255	10.43.252.0/23	10.43.252.1 – 10.43.253.254	10.43.253.255
256	10.43.254.0/23	10.43.254.1 – 10.43.255.254	10.43.255.255

01 / table

IPv4 CIDR prefix table.

Click a prefix longer than your network to split it into subnets.

prefix	subnet mask	addresses	hosts	in your /15
/0	0.0.0.0	4,294,967,296	4,294,967,294	-
/1	128.0.0.0	2,147,483,648	2,147,483,646	-
/2	192.0.0.0	1,073,741,824	1,073,741,822	-
/3	224.0.0.0	536,870,912	536,870,910	-
/4	240.0.0.0	268,435,456	268,435,454	-
/5	248.0.0.0	134,217,728	134,217,726	-
/6	252.0.0.0	67,108,864	67,108,862	-
/7	254.0.0.0	33,554,432	33,554,430	-
/8	255.0.0.0	16,777,216	16,777,214	-
/9	255.128.0.0	8,388,608	8,388,606	-
/10	255.192.0.0	4,194,304	4,194,302	-
/11	255.224.0.0	2,097,152	2,097,150	-
/12	255.240.0.0	1,048,576	1,048,574	-
/13	255.248.0.0	524,288	524,286	-
/14	255.252.0.0	262,144	262,142	-
/15	255.254.0.0	131,072	131,070	1
/16	255.255.0.0	65,536	65,534	2 split →
/17	255.255.128.0	32,768	32,766	4 split →
/18	255.255.192.0	16,384	16,382	8 split →
/19	255.255.224.0	8,192	8,190	16 split →
/20	255.255.240.0	4,096	4,094	32 split →
/21	255.255.248.0	2,048	2,046	64 split →
/22	255.255.252.0	1,024	1,022	128 split →
/23	255.255.254.0	512	510	256 split →
/24	255.255.255.0	256	254	512 split →
/25	255.255.255.128	128	126	1,024 split →
/26	255.255.255.192	64	62	2,048 split →
/27	255.255.255.224	32	30	4,096 split →
/28	255.255.255.240	16	14	8,192 split →
/29	255.255.255.248	8	6	16,384 split →
/30	255.255.255.252	4	2	32,768 split →
/31	255.255.255.254	2	2	65,536 split →
/32	255.255.255.255	1	1	131,072 split →

02 / faq

About this calculator.

How do I use this subnet calculator?

▼

Type an IP address followed by a prefix, like 192.168.1.10/24, or by a subnet mask, like 192.168.1.10 255.255.255.0. Without a prefix it uses /24. Click a row in the table to split the network into smaller subnets.

Why are usable hosts always 2 fewer?

▼

The first address in a subnet is the network address and the last is the broadcast address, so neither can go to a device. The exceptions are /31 (point-to-point links, RFC 3021) and /32 (a single address), which use every address.

Can I use it from a terminal?

▼

Yes. curl 'ipku.in/en/tools/ipv4-subnet-calculator?q=192.168.1.10/24' returns the result as plain text.

Learn how to work it out →