IB uses level3 which was purchased by centurylink.
Centurylink peers directly with many networks in their Chicago datacenter.
Here are some pings from various networks/providers.
The lowest latency connections (other than hosting at centurylink) is steadfast and colocrossing.
centurylink:
CHICAGO IL USA Ping results for:
8.17.22.31 (8.17.22.31)
Target: 8.17.22.31 with 64 data bytes
Success rate sent/received = (1/1) packets
Round-Trip min/avg/max = 0ms/0ms/0ms
cogent:
PING cdc1.ibllc.com (8.17.22.31) 56(84) bytes of data.
64 bytes from 8.17.22.31 (8.17.22.31): icmp_seq=1 ttl=249 time=2.04 ms
64 bytes from 8.17.22.31 (8.17.22.31): icmp_seq=2 ttl=249 time=2.23 ms
64 bytes from 8.17.22.31 (8.17.22.31): icmp_seq=3 ttl=249 time=2.27 ms
64 bytes from 8.17.22.31 (8.17.22.31): icmp_seq=4 ttl=249 time=2.06 ms
colocrossing:
PING cdc1.ibllc.com (8.17.22.31) 56(84) bytes of data.
64 bytes from 8.17.22.31: icmp_seq=1 ttl=247 time=3.13 ms
64 bytes from 8.17.22.31: icmp_seq=2 ttl=247 time=1.78 ms
64 bytes from 8.17.22.31: icmp_seq=3 ttl=247 time=1.66 ms
64 bytes from 8.17.22.31: icmp_seq=4 ttl=247 time=1.62 ms
ntt.net:
Router: Chicago, IL - US
Command: ping ip cdc1.ibllc.com
Sending 5, 100-byte ICMP Echos to 8.17.22.31, timeout is 2 seconds:
!!!!!
Success rate is 100 percent (5/5), round-trip min/avg/max = 1/1/2 ms
telia-coresite:
--- 8.17.22.31 ping statistics --- 5 packets transmitted, 5 packets received, 0% packet loss round-trip min/avg/max/stddev = 2.108/2.227/2.416/0.113 ms
fdcservers.net:
--- 8.17.22.31 ping statistics ---
5 packets transmitted, 5 received, 0% packet loss, time 4006ms
rtt min/avg/max/mdev = 2.072/2.154/2.251/0.060 ms
gthost.com:
--- 8.17.22.31 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 3008ms
rtt min/avg/max/mdev = 1.853/2.031/2.183/0.138 ms
vultr.com
--- 8.17.22.31 ping statistics ---
4 packets transmitted, 4 received, 0% packet loss, time 7ms
rtt min/avg/max/mdev = 1.941/2.004/2.072/0.057 ms
steadfast:
--- cdc1.ibllc.com ping statistics ---
10 packets transmitted, 10 received, 0% packet loss, time 9003ms
rtt min/avg/max/mdev = 0.636/0.781/0.921/0.096 ms