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Introduction
As part of the regular security configuration of various information resources at Virginia Tech, system administrators sometimes want to restrict access to certain services to what are commonly referred to as "Virginia Tech" hosts. There is often considerable confusion about what this means as well as which addresses should be covered in this matter. Following is information you need to know before restricting access to any of the addresses listed below.
It is imperative to note that any network traffic with source address matching one of the below addresses does not guarantee that the originator of the traffic is either affiliated with Virginia Tech or on the Virginia Tech campus. The reasons for this are varied, but include:
- the relatively open access of certain network portals on campus
- the ability for people on the Virginia Tech campus to proxy connections (willingly or otherwise) for off-campus connections
- agreements with off-campus network providers to use Virginia Tech as a means of Internet access for their Virginia Tech affiliated customers
Additionally, there are many Virginia Tech affiliates, including those who are resident at remote sites (e.g. Northern Virginia) or who have an alternative ISP, who may be inappropriately excluded from those services which use source IP address as a method of access control.
It must be recognized, therefore, that restricting access on the basis of source IP address is seldom a worthwhile security measure for services that should be available to a large portion of the Virginia Tech community. It does not accurately specify that the person of said source address is or is not a Virginia Tech affiliate, nor does access control based on IP address obviate the need for user-level access control.
A more serious concern is the management of the networks involved. On networks managed by Network Infrastructure and Services (NI&S), it is reasonably safe to say that if there is misconduct from a network user, calling 4Help will likely curtail the problem. This may or not be the case for other networks.
NI&S offers a remote access service that includes a Virtual Private Network (VPN) so that you can have an "on-campus" address no matter where you are. For more information, see Remote Access VPN (PulseSecure).
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Explanation
Following are the IP addresses for the Virginia Tech community. These data are in network address/network mask length format. For help with understanding this format, refer to Wikipedia's IPv4 Subnetting Reference.
While best effort is made to maintain the information on this page, these data are not guaranteed to be up-to-date.
(To request updates for this page, contact 4Help by clicking Get Help on the 4Help portal with the updated information.)
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Blacksburg Campus
Managed by NI&S
- Residence hall NAT (Wired and wireless)
- Academic NAT (Wireless and privately addressed wired)
- Remote access - VPN (all traffic over VPN) service
- 45.3.120.0/21
- 2607:b400:0002:ef40::/64
- General Wireless (Eduroam, VirginiaTech, Sponsored Guest Wireless)
- 172.29.0.0/16 (academic)
- 172.30.0.0/16 (academic)
- 172.31.0.0/17 (residential)
- 2607:b400:20::/44 (academic)
- 2607:b400:b0::/44 (residential)
- Guests (Non-Sponsored Wireless, Inn at VT Guest Room Wired Outlets)
- 172.25.0.0/16
- 2607:b400:0a00::/40
- Unified Communications (On-campus use only)
- General campus wired (On-campus use only)
- Residential wired (On-campus use only)
- RLAN (On-campus use only)
- Remote access - VPN (VT traffic over VPN) service (On-campus use only)
- 172.27.0.0/16
- 2607:b400:0002:ef80::/64
- 2607:b400:20::/44 Campus wireless networks IPv6
- 2001:468:c80::/48 IPv6 Global Prefix
- 2607:b400::/40 IPv6 Global Prefix
- 2002:80ad::/32 IPv6 6in4 users from 128.173.0.0/16
- 2002:c652::/32 IPv6 6in4 users from 198.82.0.0/16
- 192.70.138.0/24 Network devices only
- 192.70.187.0/24 Network devices only
External IP Addresses
Managed by Duo
- 54.241.191.128/26 2-Factor authentication (2FA) hosts
- 54.236.251.192/26 Duo hostname is duosecurity.com
- 96.127.127.224/27
Northern Virginia Center
Managed by NI&S
- 38.68.240.0/23 Wired
- 38.68.250.0/24 Wired
- 45.3.100.0/22 Academic NAT (Wireless and privately addressed wired)
- 172.20.8.0/23 Wired Private
- 172.20.10.0/23 Wireless Private
- 45.3.96.0/22 Wired
- 38.68.242.0/23 Wireless
Blacksburg Residential
- 63.164.28.0/24 VTACS "Virginia Tech affiliates"
- 63.164.29.0/24 63.164.30.0/23 The Inn at Virginia Tech
Richmond Outreach Office
Managed by RC
- 208.16.73.0/24
- 38.68.255.64/26
Equine Medical Center
Managed by NI&S
- 38.68.252.0/24
- 38.68.198.0/24
Occoquan Lab
Managed by NCR
38.68.253.0/24
601 Prince Street, Alexandria
Managed by NCR
38.68.254.0/24
1021/1001 Prince Street, Alexandria
Managed by NCR
38.68.251.0/24
Hampton Roads Higher Ed and Extension Center
Managed by EXT
208.22.130.0/24
Roanoke Education Center
63.167.242.0/24
WVTF in Roanoke
Managed by VTA
- 70.165.101.22 - 70.165.101.26
- 68.111.1.78
- 66.210.103.0 - 66.210.103.15/28
Center for European Studies and Architecture, Switzerland
Managed by CESA
195.176.186.64/28
Richmond Graduate Center
Managed by RC
206.105.198.0/24
Virginia Cooperative Extension
Managed by EXT
208.22.128.0/19
Virginia Tech Research Center, 900 North Glebe, Arlington
Managed by NCR
- 38.68.224.0/20
- 2607:b400:800::/48
Tire center near Danville
64.203.145.225/25
VT Customer Subnets on Cloud Platforms
Managed by NI&S
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Blacksburg Campus
Notes
- The routers managed by NI&S are configured in accordance with best-practice methods to ensure that traffic with source addresses that should be on-campus do not enter the campus from outside and vice-versa.
- When arranging with off-campus providers, these providers may not issue a "Virginia Tech IP address" to non-Virginia Tech affiliates.
National Capital Region (NCR)
Notes
Richmond Center (RC)
Extension (EXT)
VTACS (VTACS)
Center for European Studies and Architecture (CESA)
Virginia Tech Advancement
ARIN Whois
You may also be able to find contact information for these sites using ARIN's Whois search.
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