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)10.40.0.0/16

network10.40.0.0/16

broadcast10.40.255.255

first host10.40.0.1

last host10.40.255.254

subnet mask255.255.0.0

wildcard0.0.255.255

addresses65,536

usable hosts65,534

classA

ipcalc 10.40.0.0/16

address00001010.00101000.00000000.00000000

subnet mask11111111.11111111.00000000.00000000

network00001010.00101000.00000000.00000000

broadcast00001010.00101000.11111111.11111111

green = network part, grey = host part

hex0x0a280000

decimal170393600

reverse dns0.0.40.10.in-addr.arpa

ipv4-mapped::ffff:a28:0

/16 split into /24 · 256 subnets

close ×

#	network	host range	broadcast
1	10.40.0.0/24	10.40.0.1 – 10.40.0.254	10.40.0.255
2	10.40.1.0/24	10.40.1.1 – 10.40.1.254	10.40.1.255
3	10.40.2.0/24	10.40.2.1 – 10.40.2.254	10.40.2.255
4	10.40.3.0/24	10.40.3.1 – 10.40.3.254	10.40.3.255
5	10.40.4.0/24	10.40.4.1 – 10.40.4.254	10.40.4.255
6	10.40.5.0/24	10.40.5.1 – 10.40.5.254	10.40.5.255
7	10.40.6.0/24	10.40.6.1 – 10.40.6.254	10.40.6.255
8	10.40.7.0/24	10.40.7.1 – 10.40.7.254	10.40.7.255
9	10.40.8.0/24	10.40.8.1 – 10.40.8.254	10.40.8.255
10	10.40.9.0/24	10.40.9.1 – 10.40.9.254	10.40.9.255
11	10.40.10.0/24	10.40.10.1 – 10.40.10.254	10.40.10.255
12	10.40.11.0/24	10.40.11.1 – 10.40.11.254	10.40.11.255
13	10.40.12.0/24	10.40.12.1 – 10.40.12.254	10.40.12.255
14	10.40.13.0/24	10.40.13.1 – 10.40.13.254	10.40.13.255
15	10.40.14.0/24	10.40.14.1 – 10.40.14.254	10.40.14.255
16	10.40.15.0/24	10.40.15.1 – 10.40.15.254	10.40.15.255
17	10.40.16.0/24	10.40.16.1 – 10.40.16.254	10.40.16.255
18	10.40.17.0/24	10.40.17.1 – 10.40.17.254	10.40.17.255
19	10.40.18.0/24	10.40.18.1 – 10.40.18.254	10.40.18.255
20	10.40.19.0/24	10.40.19.1 – 10.40.19.254	10.40.19.255
21	10.40.20.0/24	10.40.20.1 – 10.40.20.254	10.40.20.255
22	10.40.21.0/24	10.40.21.1 – 10.40.21.254	10.40.21.255
23	10.40.22.0/24	10.40.22.1 – 10.40.22.254	10.40.22.255
24	10.40.23.0/24	10.40.23.1 – 10.40.23.254	10.40.23.255
25	10.40.24.0/24	10.40.24.1 – 10.40.24.254	10.40.24.255
26	10.40.25.0/24	10.40.25.1 – 10.40.25.254	10.40.25.255
27	10.40.26.0/24	10.40.26.1 – 10.40.26.254	10.40.26.255
28	10.40.27.0/24	10.40.27.1 – 10.40.27.254	10.40.27.255
29	10.40.28.0/24	10.40.28.1 – 10.40.28.254	10.40.28.255
30	10.40.29.0/24	10.40.29.1 – 10.40.29.254	10.40.29.255
31	10.40.30.0/24	10.40.30.1 – 10.40.30.254	10.40.30.255
32	10.40.31.0/24	10.40.31.1 – 10.40.31.254	10.40.31.255
33	10.40.32.0/24	10.40.32.1 – 10.40.32.254	10.40.32.255
34	10.40.33.0/24	10.40.33.1 – 10.40.33.254	10.40.33.255
35	10.40.34.0/24	10.40.34.1 – 10.40.34.254	10.40.34.255
36	10.40.35.0/24	10.40.35.1 – 10.40.35.254	10.40.35.255
37	10.40.36.0/24	10.40.36.1 – 10.40.36.254	10.40.36.255
38	10.40.37.0/24	10.40.37.1 – 10.40.37.254	10.40.37.255
39	10.40.38.0/24	10.40.38.1 – 10.40.38.254	10.40.38.255
40	10.40.39.0/24	10.40.39.1 – 10.40.39.254	10.40.39.255
41	10.40.40.0/24	10.40.40.1 – 10.40.40.254	10.40.40.255
42	10.40.41.0/24	10.40.41.1 – 10.40.41.254	10.40.41.255
43	10.40.42.0/24	10.40.42.1 – 10.40.42.254	10.40.42.255
44	10.40.43.0/24	10.40.43.1 – 10.40.43.254	10.40.43.255
45	10.40.44.0/24	10.40.44.1 – 10.40.44.254	10.40.44.255
46	10.40.45.0/24	10.40.45.1 – 10.40.45.254	10.40.45.255
47	10.40.46.0/24	10.40.46.1 – 10.40.46.254	10.40.46.255
48	10.40.47.0/24	10.40.47.1 – 10.40.47.254	10.40.47.255
49	10.40.48.0/24	10.40.48.1 – 10.40.48.254	10.40.48.255
50	10.40.49.0/24	10.40.49.1 – 10.40.49.254	10.40.49.255
51	10.40.50.0/24	10.40.50.1 – 10.40.50.254	10.40.50.255
52	10.40.51.0/24	10.40.51.1 – 10.40.51.254	10.40.51.255
53	10.40.52.0/24	10.40.52.1 – 10.40.52.254	10.40.52.255
54	10.40.53.0/24	10.40.53.1 – 10.40.53.254	10.40.53.255
55	10.40.54.0/24	10.40.54.1 – 10.40.54.254	10.40.54.255
56	10.40.55.0/24	10.40.55.1 – 10.40.55.254	10.40.55.255
57	10.40.56.0/24	10.40.56.1 – 10.40.56.254	10.40.56.255
58	10.40.57.0/24	10.40.57.1 – 10.40.57.254	10.40.57.255
59	10.40.58.0/24	10.40.58.1 – 10.40.58.254	10.40.58.255
60	10.40.59.0/24	10.40.59.1 – 10.40.59.254	10.40.59.255
61	10.40.60.0/24	10.40.60.1 – 10.40.60.254	10.40.60.255
62	10.40.61.0/24	10.40.61.1 – 10.40.61.254	10.40.61.255
63	10.40.62.0/24	10.40.62.1 – 10.40.62.254	10.40.62.255
64	10.40.63.0/24	10.40.63.1 – 10.40.63.254	10.40.63.255
65	10.40.64.0/24	10.40.64.1 – 10.40.64.254	10.40.64.255
66	10.40.65.0/24	10.40.65.1 – 10.40.65.254	10.40.65.255
67	10.40.66.0/24	10.40.66.1 – 10.40.66.254	10.40.66.255
68	10.40.67.0/24	10.40.67.1 – 10.40.67.254	10.40.67.255
69	10.40.68.0/24	10.40.68.1 – 10.40.68.254	10.40.68.255
70	10.40.69.0/24	10.40.69.1 – 10.40.69.254	10.40.69.255
71	10.40.70.0/24	10.40.70.1 – 10.40.70.254	10.40.70.255
72	10.40.71.0/24	10.40.71.1 – 10.40.71.254	10.40.71.255
73	10.40.72.0/24	10.40.72.1 – 10.40.72.254	10.40.72.255
74	10.40.73.0/24	10.40.73.1 – 10.40.73.254	10.40.73.255
75	10.40.74.0/24	10.40.74.1 – 10.40.74.254	10.40.74.255
76	10.40.75.0/24	10.40.75.1 – 10.40.75.254	10.40.75.255
77	10.40.76.0/24	10.40.76.1 – 10.40.76.254	10.40.76.255
78	10.40.77.0/24	10.40.77.1 – 10.40.77.254	10.40.77.255
79	10.40.78.0/24	10.40.78.1 – 10.40.78.254	10.40.78.255
80	10.40.79.0/24	10.40.79.1 – 10.40.79.254	10.40.79.255
81	10.40.80.0/24	10.40.80.1 – 10.40.80.254	10.40.80.255
82	10.40.81.0/24	10.40.81.1 – 10.40.81.254	10.40.81.255
83	10.40.82.0/24	10.40.82.1 – 10.40.82.254	10.40.82.255
84	10.40.83.0/24	10.40.83.1 – 10.40.83.254	10.40.83.255
85	10.40.84.0/24	10.40.84.1 – 10.40.84.254	10.40.84.255
86	10.40.85.0/24	10.40.85.1 – 10.40.85.254	10.40.85.255
87	10.40.86.0/24	10.40.86.1 – 10.40.86.254	10.40.86.255
88	10.40.87.0/24	10.40.87.1 – 10.40.87.254	10.40.87.255
89	10.40.88.0/24	10.40.88.1 – 10.40.88.254	10.40.88.255
90	10.40.89.0/24	10.40.89.1 – 10.40.89.254	10.40.89.255
91	10.40.90.0/24	10.40.90.1 – 10.40.90.254	10.40.90.255
92	10.40.91.0/24	10.40.91.1 – 10.40.91.254	10.40.91.255
93	10.40.92.0/24	10.40.92.1 – 10.40.92.254	10.40.92.255
94	10.40.93.0/24	10.40.93.1 – 10.40.93.254	10.40.93.255
95	10.40.94.0/24	10.40.94.1 – 10.40.94.254	10.40.94.255
96	10.40.95.0/24	10.40.95.1 – 10.40.95.254	10.40.95.255
97	10.40.96.0/24	10.40.96.1 – 10.40.96.254	10.40.96.255
98	10.40.97.0/24	10.40.97.1 – 10.40.97.254	10.40.97.255
99	10.40.98.0/24	10.40.98.1 – 10.40.98.254	10.40.98.255
100	10.40.99.0/24	10.40.99.1 – 10.40.99.254	10.40.99.255
101	10.40.100.0/24	10.40.100.1 – 10.40.100.254	10.40.100.255
102	10.40.101.0/24	10.40.101.1 – 10.40.101.254	10.40.101.255
103	10.40.102.0/24	10.40.102.1 – 10.40.102.254	10.40.102.255
104	10.40.103.0/24	10.40.103.1 – 10.40.103.254	10.40.103.255
105	10.40.104.0/24	10.40.104.1 – 10.40.104.254	10.40.104.255
106	10.40.105.0/24	10.40.105.1 – 10.40.105.254	10.40.105.255
107	10.40.106.0/24	10.40.106.1 – 10.40.106.254	10.40.106.255
108	10.40.107.0/24	10.40.107.1 – 10.40.107.254	10.40.107.255
109	10.40.108.0/24	10.40.108.1 – 10.40.108.254	10.40.108.255
110	10.40.109.0/24	10.40.109.1 – 10.40.109.254	10.40.109.255
111	10.40.110.0/24	10.40.110.1 – 10.40.110.254	10.40.110.255
112	10.40.111.0/24	10.40.111.1 – 10.40.111.254	10.40.111.255
113	10.40.112.0/24	10.40.112.1 – 10.40.112.254	10.40.112.255
114	10.40.113.0/24	10.40.113.1 – 10.40.113.254	10.40.113.255
115	10.40.114.0/24	10.40.114.1 – 10.40.114.254	10.40.114.255
116	10.40.115.0/24	10.40.115.1 – 10.40.115.254	10.40.115.255
117	10.40.116.0/24	10.40.116.1 – 10.40.116.254	10.40.116.255
118	10.40.117.0/24	10.40.117.1 – 10.40.117.254	10.40.117.255
119	10.40.118.0/24	10.40.118.1 – 10.40.118.254	10.40.118.255
120	10.40.119.0/24	10.40.119.1 – 10.40.119.254	10.40.119.255
121	10.40.120.0/24	10.40.120.1 – 10.40.120.254	10.40.120.255
122	10.40.121.0/24	10.40.121.1 – 10.40.121.254	10.40.121.255
123	10.40.122.0/24	10.40.122.1 – 10.40.122.254	10.40.122.255
124	10.40.123.0/24	10.40.123.1 – 10.40.123.254	10.40.123.255
125	10.40.124.0/24	10.40.124.1 – 10.40.124.254	10.40.124.255
126	10.40.125.0/24	10.40.125.1 – 10.40.125.254	10.40.125.255
127	10.40.126.0/24	10.40.126.1 – 10.40.126.254	10.40.126.255
128	10.40.127.0/24	10.40.127.1 – 10.40.127.254	10.40.127.255
129	10.40.128.0/24	10.40.128.1 – 10.40.128.254	10.40.128.255
130	10.40.129.0/24	10.40.129.1 – 10.40.129.254	10.40.129.255
131	10.40.130.0/24	10.40.130.1 – 10.40.130.254	10.40.130.255
132	10.40.131.0/24	10.40.131.1 – 10.40.131.254	10.40.131.255
133	10.40.132.0/24	10.40.132.1 – 10.40.132.254	10.40.132.255
134	10.40.133.0/24	10.40.133.1 – 10.40.133.254	10.40.133.255
135	10.40.134.0/24	10.40.134.1 – 10.40.134.254	10.40.134.255
136	10.40.135.0/24	10.40.135.1 – 10.40.135.254	10.40.135.255
137	10.40.136.0/24	10.40.136.1 – 10.40.136.254	10.40.136.255
138	10.40.137.0/24	10.40.137.1 – 10.40.137.254	10.40.137.255
139	10.40.138.0/24	10.40.138.1 – 10.40.138.254	10.40.138.255
140	10.40.139.0/24	10.40.139.1 – 10.40.139.254	10.40.139.255
141	10.40.140.0/24	10.40.140.1 – 10.40.140.254	10.40.140.255
142	10.40.141.0/24	10.40.141.1 – 10.40.141.254	10.40.141.255
143	10.40.142.0/24	10.40.142.1 – 10.40.142.254	10.40.142.255
144	10.40.143.0/24	10.40.143.1 – 10.40.143.254	10.40.143.255
145	10.40.144.0/24	10.40.144.1 – 10.40.144.254	10.40.144.255
146	10.40.145.0/24	10.40.145.1 – 10.40.145.254	10.40.145.255
147	10.40.146.0/24	10.40.146.1 – 10.40.146.254	10.40.146.255
148	10.40.147.0/24	10.40.147.1 – 10.40.147.254	10.40.147.255
149	10.40.148.0/24	10.40.148.1 – 10.40.148.254	10.40.148.255
150	10.40.149.0/24	10.40.149.1 – 10.40.149.254	10.40.149.255
151	10.40.150.0/24	10.40.150.1 – 10.40.150.254	10.40.150.255
152	10.40.151.0/24	10.40.151.1 – 10.40.151.254	10.40.151.255
153	10.40.152.0/24	10.40.152.1 – 10.40.152.254	10.40.152.255
154	10.40.153.0/24	10.40.153.1 – 10.40.153.254	10.40.153.255
155	10.40.154.0/24	10.40.154.1 – 10.40.154.254	10.40.154.255
156	10.40.155.0/24	10.40.155.1 – 10.40.155.254	10.40.155.255
157	10.40.156.0/24	10.40.156.1 – 10.40.156.254	10.40.156.255
158	10.40.157.0/24	10.40.157.1 – 10.40.157.254	10.40.157.255
159	10.40.158.0/24	10.40.158.1 – 10.40.158.254	10.40.158.255
160	10.40.159.0/24	10.40.159.1 – 10.40.159.254	10.40.159.255
161	10.40.160.0/24	10.40.160.1 – 10.40.160.254	10.40.160.255
162	10.40.161.0/24	10.40.161.1 – 10.40.161.254	10.40.161.255
163	10.40.162.0/24	10.40.162.1 – 10.40.162.254	10.40.162.255
164	10.40.163.0/24	10.40.163.1 – 10.40.163.254	10.40.163.255
165	10.40.164.0/24	10.40.164.1 – 10.40.164.254	10.40.164.255
166	10.40.165.0/24	10.40.165.1 – 10.40.165.254	10.40.165.255
167	10.40.166.0/24	10.40.166.1 – 10.40.166.254	10.40.166.255
168	10.40.167.0/24	10.40.167.1 – 10.40.167.254	10.40.167.255
169	10.40.168.0/24	10.40.168.1 – 10.40.168.254	10.40.168.255
170	10.40.169.0/24	10.40.169.1 – 10.40.169.254	10.40.169.255
171	10.40.170.0/24	10.40.170.1 – 10.40.170.254	10.40.170.255
172	10.40.171.0/24	10.40.171.1 – 10.40.171.254	10.40.171.255
173	10.40.172.0/24	10.40.172.1 – 10.40.172.254	10.40.172.255
174	10.40.173.0/24	10.40.173.1 – 10.40.173.254	10.40.173.255
175	10.40.174.0/24	10.40.174.1 – 10.40.174.254	10.40.174.255
176	10.40.175.0/24	10.40.175.1 – 10.40.175.254	10.40.175.255
177	10.40.176.0/24	10.40.176.1 – 10.40.176.254	10.40.176.255
178	10.40.177.0/24	10.40.177.1 – 10.40.177.254	10.40.177.255
179	10.40.178.0/24	10.40.178.1 – 10.40.178.254	10.40.178.255
180	10.40.179.0/24	10.40.179.1 – 10.40.179.254	10.40.179.255
181	10.40.180.0/24	10.40.180.1 – 10.40.180.254	10.40.180.255
182	10.40.181.0/24	10.40.181.1 – 10.40.181.254	10.40.181.255
183	10.40.182.0/24	10.40.182.1 – 10.40.182.254	10.40.182.255
184	10.40.183.0/24	10.40.183.1 – 10.40.183.254	10.40.183.255
185	10.40.184.0/24	10.40.184.1 – 10.40.184.254	10.40.184.255
186	10.40.185.0/24	10.40.185.1 – 10.40.185.254	10.40.185.255
187	10.40.186.0/24	10.40.186.1 – 10.40.186.254	10.40.186.255
188	10.40.187.0/24	10.40.187.1 – 10.40.187.254	10.40.187.255
189	10.40.188.0/24	10.40.188.1 – 10.40.188.254	10.40.188.255
190	10.40.189.0/24	10.40.189.1 – 10.40.189.254	10.40.189.255
191	10.40.190.0/24	10.40.190.1 – 10.40.190.254	10.40.190.255
192	10.40.191.0/24	10.40.191.1 – 10.40.191.254	10.40.191.255
193	10.40.192.0/24	10.40.192.1 – 10.40.192.254	10.40.192.255
194	10.40.193.0/24	10.40.193.1 – 10.40.193.254	10.40.193.255
195	10.40.194.0/24	10.40.194.1 – 10.40.194.254	10.40.194.255
196	10.40.195.0/24	10.40.195.1 – 10.40.195.254	10.40.195.255
197	10.40.196.0/24	10.40.196.1 – 10.40.196.254	10.40.196.255
198	10.40.197.0/24	10.40.197.1 – 10.40.197.254	10.40.197.255
199	10.40.198.0/24	10.40.198.1 – 10.40.198.254	10.40.198.255
200	10.40.199.0/24	10.40.199.1 – 10.40.199.254	10.40.199.255
201	10.40.200.0/24	10.40.200.1 – 10.40.200.254	10.40.200.255
202	10.40.201.0/24	10.40.201.1 – 10.40.201.254	10.40.201.255
203	10.40.202.0/24	10.40.202.1 – 10.40.202.254	10.40.202.255
204	10.40.203.0/24	10.40.203.1 – 10.40.203.254	10.40.203.255
205	10.40.204.0/24	10.40.204.1 – 10.40.204.254	10.40.204.255
206	10.40.205.0/24	10.40.205.1 – 10.40.205.254	10.40.205.255
207	10.40.206.0/24	10.40.206.1 – 10.40.206.254	10.40.206.255
208	10.40.207.0/24	10.40.207.1 – 10.40.207.254	10.40.207.255
209	10.40.208.0/24	10.40.208.1 – 10.40.208.254	10.40.208.255
210	10.40.209.0/24	10.40.209.1 – 10.40.209.254	10.40.209.255
211	10.40.210.0/24	10.40.210.1 – 10.40.210.254	10.40.210.255
212	10.40.211.0/24	10.40.211.1 – 10.40.211.254	10.40.211.255
213	10.40.212.0/24	10.40.212.1 – 10.40.212.254	10.40.212.255
214	10.40.213.0/24	10.40.213.1 – 10.40.213.254	10.40.213.255
215	10.40.214.0/24	10.40.214.1 – 10.40.214.254	10.40.214.255
216	10.40.215.0/24	10.40.215.1 – 10.40.215.254	10.40.215.255
217	10.40.216.0/24	10.40.216.1 – 10.40.216.254	10.40.216.255
218	10.40.217.0/24	10.40.217.1 – 10.40.217.254	10.40.217.255
219	10.40.218.0/24	10.40.218.1 – 10.40.218.254	10.40.218.255
220	10.40.219.0/24	10.40.219.1 – 10.40.219.254	10.40.219.255
221	10.40.220.0/24	10.40.220.1 – 10.40.220.254	10.40.220.255
222	10.40.221.0/24	10.40.221.1 – 10.40.221.254	10.40.221.255
223	10.40.222.0/24	10.40.222.1 – 10.40.222.254	10.40.222.255
224	10.40.223.0/24	10.40.223.1 – 10.40.223.254	10.40.223.255
225	10.40.224.0/24	10.40.224.1 – 10.40.224.254	10.40.224.255
226	10.40.225.0/24	10.40.225.1 – 10.40.225.254	10.40.225.255
227	10.40.226.0/24	10.40.226.1 – 10.40.226.254	10.40.226.255
228	10.40.227.0/24	10.40.227.1 – 10.40.227.254	10.40.227.255
229	10.40.228.0/24	10.40.228.1 – 10.40.228.254	10.40.228.255
230	10.40.229.0/24	10.40.229.1 – 10.40.229.254	10.40.229.255
231	10.40.230.0/24	10.40.230.1 – 10.40.230.254	10.40.230.255
232	10.40.231.0/24	10.40.231.1 – 10.40.231.254	10.40.231.255
233	10.40.232.0/24	10.40.232.1 – 10.40.232.254	10.40.232.255
234	10.40.233.0/24	10.40.233.1 – 10.40.233.254	10.40.233.255
235	10.40.234.0/24	10.40.234.1 – 10.40.234.254	10.40.234.255
236	10.40.235.0/24	10.40.235.1 – 10.40.235.254	10.40.235.255
237	10.40.236.0/24	10.40.236.1 – 10.40.236.254	10.40.236.255
238	10.40.237.0/24	10.40.237.1 – 10.40.237.254	10.40.237.255
239	10.40.238.0/24	10.40.238.1 – 10.40.238.254	10.40.238.255
240	10.40.239.0/24	10.40.239.1 – 10.40.239.254	10.40.239.255
241	10.40.240.0/24	10.40.240.1 – 10.40.240.254	10.40.240.255
242	10.40.241.0/24	10.40.241.1 – 10.40.241.254	10.40.241.255
243	10.40.242.0/24	10.40.242.1 – 10.40.242.254	10.40.242.255
244	10.40.243.0/24	10.40.243.1 – 10.40.243.254	10.40.243.255
245	10.40.244.0/24	10.40.244.1 – 10.40.244.254	10.40.244.255
246	10.40.245.0/24	10.40.245.1 – 10.40.245.254	10.40.245.255
247	10.40.246.0/24	10.40.246.1 – 10.40.246.254	10.40.246.255
248	10.40.247.0/24	10.40.247.1 – 10.40.247.254	10.40.247.255
249	10.40.248.0/24	10.40.248.1 – 10.40.248.254	10.40.248.255
250	10.40.249.0/24	10.40.249.1 – 10.40.249.254	10.40.249.255
251	10.40.250.0/24	10.40.250.1 – 10.40.250.254	10.40.250.255
252	10.40.251.0/24	10.40.251.1 – 10.40.251.254	10.40.251.255
253	10.40.252.0/24	10.40.252.1 – 10.40.252.254	10.40.252.255
254	10.40.253.0/24	10.40.253.1 – 10.40.253.254	10.40.253.255
255	10.40.254.0/24	10.40.254.1 – 10.40.254.254	10.40.254.255
256	10.40.255.0/24	10.40.255.1 – 10.40.255.254	10.40.255.255

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 /16
/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	-
/16	255.255.0.0	65,536	65,534	1
/17	255.255.128.0	32,768	32,766	2 split →
/18	255.255.192.0	16,384	16,382	4 split →
/19	255.255.224.0	8,192	8,190	8 split →
/20	255.255.240.0	4,096	4,094	16 split →
/21	255.255.248.0	2,048	2,046	32 split →
/22	255.255.252.0	1,024	1,022	64 split →
/23	255.255.254.0	512	510	128 split →
/24	255.255.255.0	256	254	256 split →
/25	255.255.255.128	128	126	512 split →
/26	255.255.255.192	64	62	1,024 split →
/27	255.255.255.224	32	30	2,048 split →
/28	255.255.255.240	16	14	4,096 split →
/29	255.255.255.248	8	6	8,192 split →
/30	255.255.255.252	4	2	16,384 split →
/31	255.255.255.254	2	2	32,768 split →
/32	255.255.255.255	1	1	65,536 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 →