Campus IP Space
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Each building network provides a Class A IPv4 subnet and an IPv6 subnet.
IPv4 addresses are private and not accessible directly from the internet. Network address translation (NAT) is used to pass traffic to the internet. All private addresses can be directly accessed on campus.
Devices are automatically assigned a temporary address through DHCP, starting at the top end of each IP range. Static IP addresses are assigned at the bottom of the range. For example:
| Subnet | 10.4.0.0/21 |
|---|---|
| Subnet mask | 255.255.248.0 |
| IP range | 10.4.0.1 to 10.4.7.254 |
| Dynamic range | 10.4.0.100 to 10.4.7.254 |
| Static range | 10.4.0.6 to 10.4.0.99 |
| Reserved for network infrastructure |
10.4.0.1 to 10.4.0.5 |
Public IP Space
The University of Arkansas has been allocated public IP space in the range of 130.184.0.0/16.
Building networks are being converted to use private IP space, bringing increased security, hostname-based dynamic DNS and increased subnet capacity. Public IP addresses are assigned on a case-by-case basis only.
NAT (Network Address Translation)
Private IPs NAT at the campus central firewall to internet hosts only.
Private networks route to all campus IP space, including 130.184.0.0/255.255.0.0 directly.
An external IP will appear as an address in the 130.184.253.0/255.255.255.0 subnet.
Most applications will operate in a NAT environment.
Static Private IP Guidelines
Static IP address are allocated in address blocks outside of the DHCP ranges above.
Users can request static IP addresses by creating a ticket.
Approved campus IT can use the Infoblox Grid tool at https://ipam.uark.edu to register static IP devices or schedule changes. The network team must approve changes and additions. VPN is required when connecting to Infoblox, even when on campus.