AS391 is the autonomous system of Air Force Systems Networking. It holds 281,856 IPv4 addresses in 37 prefixes, mainly in 
United States.
By IPv4 addresses the network ranks #834 worldwide and #235 of 18,202 networks in United States. That is 0.02% of the country’s IPv4 space.
The largest block is 137.11.0.0 to 137.11.255.255 with 65,536 addresses, geolocated to Montgomery.
- IPv4 addresses
- 281,856
- IPv4 prefixes
- 37
- World rank
- #834
- Country share
- 0.02%
Addresses by country
- United States 100%
Largest blocks
- 137.11.0.0 Montgomery65,536
- 137.0.0.0 Montgomery65,536
- 128.236.0.0 Montgomery65,536
- 128.202.0.0 Montgomery65,536
- 131.15.48.0 Montgomery3,840
- 131.15.38.0 Montgomery2,304
- 131.15.160.0 Montgomery2,048
- 131.15.144.0 Montgomery2,048
Networks of similar size
284,160
282,624
282,624
281,344
281,088
281,088IPv4 prefixes
- 128.202.0.0/16
- 128.236.0.0/16
- 131.15.38.0/23
- 131.15.40.0/22
- 131.15.44.0/23
- 131.15.46.0/24
- 131.15.48.0/21
- 131.15.56.0/22
- 131.15.60.0/23
- 131.15.62.0/24
- 131.15.65.0/24
- 131.15.68.0/22
- 131.15.80.0/24
- 131.15.88.0/24
- 131.15.90.0/23
- 131.15.92.0/24
- 131.15.98.0/23
- 131.15.120.0/24
- 131.15.136.0/24
- 131.15.144.0/21
- 131.15.160.0/21
- 131.15.208.0/24
- 131.15.233.0/24
- 131.15.234.0/23
- 131.15.236.0/22
- 131.15.252.0/23
- 137.0.0.0/16
- 137.11.0.0/16
- 143.141.96.0/22
- 199.31.2.0/23
- 199.251.155.0/24
- 199.251.156.0/24
- 204.34.211.0/24
- 206.39.56.0/24
- 206.39.58.0/24
- 207.133.179.0/24
- 207.133.189.0/24
Questions and answers
Who owns AS391?
Autonomous system AS391 is operated by Air Force Systems Networking.
How many IP addresses does AS391 have?
The network holds 281,856 IPv4 addresses in 37 prefixes.
Which country is AS391 in?
The main country is United States.
How big is AS391?
By IPv4 addresses it ranks #834 worldwide.
What is the largest address block of AS391?
137.11.0.0 to 137.11.255.255, 65,536 addresses.