This document is a companion to the article 1.1.1.1: Fast, but not so accurate (yet).
"A" response records for Slack, and network connectivity and latency to the answers, from Comcast in Memphis, TN. Tests conducted 2018-04-04.
Note: Traceroutes into Amazon-operated networks, including CloudFront, have a tendency to be obfuscated due to network topology and ICMP policy.
Querying the A record for slack.com, 1.1.1.1 gives a mediocre answer. The most
optimal result came from Comcast, pointing to a server in Dallas.
1.1.1.1 resolved slack.com to 52.222.216.88 (server-52-222-216-88.msp50.r.cloudfront.net) in Minneapolis, 15 hops, ping average 50.0 ms.
[parse@word ~]$ dig +short A slack.com @1.1.1.1
52.222.216.88
[parse@word ~]$ mtr -c 100 52.222.216.88
Host Loss% Snt Last Avg Best Wrst StDev
1. router-external.home.lan 0.0% 100 1.2 1.3 0.8 4.6 0.6
2. 96.120.15.nnn 0.0% 100 20.4 12.6 9.6 41.0 4.8
3. Te5-4-ur01.bartlett.tn.malt.comca 0.0% 100 11.5 12.4 8.9 33.7 4.3
4. 68.86.242.157 0.0% 100 11.6 12.4 9.9 36.7 4.2
5. be-92-ar02.dannythomas.tn.malt.co 0.0% 100 13.2 14.3 10.7 38.9 4.6
6. be-22258-cr02.dallas.tx.ibone.com 0.0% 100 24.0 24.0 20.3 48.3 4.0
7. be-12441-pe01.1950stemmons.tx.ibo 0.0% 100 20.2 23.2 20.0 55.9 5.8
8. dls-b21-link.telia.net 0.0% 100 21.3 24.5 20.1 51.7 6.1
9. kanc-b1-link.telia.net 0.0% 100 60.5 34.4 30.2 71.0 6.7
10. mini-b1-link.telia.net 0.0% 100 51.2 52.6 48.3 77.5 5.7
11. a100-ic-323047-mini-b1.c.telia.ne 0.0% 100 50.9 51.7 48.3 75.3 4.5
12. ???
13. ???
14. ???
15. server-52-222-216-88.msp50.r.clou 0.0% 100 49.9 50.0 47.5 77.5 4.0
4.2.2.4 resolved slack.com to 52.84.216.34 (server-52-84-216-34.stl2.r.cloudfront.net) in St. Louis, 16 hops, ping average 36.0 ms.
[parse@word ~]$ dig +short A slack.com @4.2.2.4
52.84.216.34
[parse@word ~]$ mtr -c 100 52.84.216.34
Host Loss% Snt Last Avg Best Wrst StDev
1. router-external.home.lan 0.0% 100 1.0 2.2 0.9 31.1 4.8
2. 96.120.15.nnn 0.0% 100 10.6 13.3 8.8 42.5 5.4
3. 68.85.55.249 0.0% 100 10.9 12.4 9.6 32.2 3.6
4. be-92-ar02.dannythomas.tn.malt.co 0.0% 100 13.3 13.2 10.3 32.4 3.2
5. be-22258-cr02.dallas.tx.ibone.com 0.0% 100 23.2 23.3 20.8 32.5 2.2
6. be-11724-cr02.denver.co.ibone.com 0.0% 100 58.2 38.1 34.2 66.1 4.9
7. be-11795-pe02.910fifteenth.co.ibo 0.0% 100 34.5 36.6 33.3 63.9 4.4
8. 23.30.207.26 0.0% 100 47.0 37.3 33.3 60.2 5.7
9. ???
10. ???
11. ???
12. ???
13. ???
14. ???
15. ???
16. server-52-84-216-34.stl2.r.cloudf 0.0% 100 33.4 36.0 32.2 64.5 5.0
8.8.8.8 resolved slack.com to 52.84.124.154 (server-52-84-124-154.iad16.r.cloudfront.net) in northern Virginia, 18 hops, ping average 45.2 ms.
[parse@word ~]$ dig +short A slack.com @8.8.8.8
52.84.124.154
[parse@word ~]$ mtr -c 100 52.84.124.154
Host Loss% Snt Last Avg Best Wrst StDev
1. router-external.home.lan 0.0% 100 1.1 1.5 0.8 21.6 2.4
2. 96.120.15.nnn 0.0% 100 11.4 13.1 9.9 39.1 4.4
3. 68.85.55.249 0.0% 100 12.1 12.6 9.4 39.4 5.0
4. be-92-ar02.dannythomas.tn.malt.co 0.0% 100 13.1 13.9 10.7 43.2 4.7
5. be-22258-cr02.dallas.tx.ibone.com 0.0% 100 22.7 24.1 20.9 46.2 4.4
6. be-12441-pe01.1950stemmons.tx.ibo 0.0% 100 23.2 22.1 19.8 38.1 2.5
7. 23.30.207.150 0.0% 100 32.3 24.4 19.8 58.2 6.0
8. 54.239.105.111 0.0% 100 47.2 56.8 44.6 89.4 7.9
9. ???
10. ???
11. ???
12. ???
13. ???
14. 72.21.220.25 0.0% 100 45.7 47.3 43.5 74.8 5.9
15. ???
16. ???
17. ???
18. server-52-84-124-154.iad16.r.clou 0.0% 100 44.3 45.2 42.4 71.5 3.8
9.9.9.9 resolved slack.com to 52.84.91.113 (server-52-84-91-113.yul62.r.cloudfront.net) in Montreal, Quebec, Canada, 23 hops, ping average 58.2 ms.
[parse@word ~]$ dig +short A slack.com @9.9.9.9
52.84.91.113
[parse@word ~]$ mtr -c 100 52.84.91.113
Host Loss% Snt Last Avg Best Wrst StDev
1. router-external.home.lan 0.0% 100 3.7 1.9 0.9 24.1 2.9
2. 96.120.15.nnn 0.0% 100 11.7 12.1 8.9 40.0 3.8
3. 68.85.55.249 0.0% 100 10.8 12.9 9.0 46.7 4.8
4. be-92-ar02.dannythomas.tn.malt.co 0.0% 100 14.4 14.5 11.1 38.9 5.2
5. be-22258-cr02.dallas.tx.ibone.com 0.0% 100 22.3 24.0 20.3 42.8 3.9
6. be-12441-pe01.1950stemmons.tx.ibo 0.0% 100 22.9 22.8 20.1 45.6 3.8
7. dls-b21-link.telia.net 0.0% 100 22.0 24.5 20.1 51.7 5.7
8. atl-b22-link.telia.net 0.0% 100 39.1 36.0 30.1 62.1 5.6
9. ash-bb3-link.telia.net 1.0% 100 43.8 46.2 41.7 73.3 5.7
10. nyk-bb3-link.telia.net 8.1% 100 50.3 57.8 48.8 91.1 9.3
11. nyk-b5-link.telia.net 0.0% 100 69.4 56.8 48.9 89.5 6.2
12. 80.239.132.214 1.0% 100 53.4 52.6 48.5 76.1 4.1
13. ???
14. ???
15. ???
16. ???
17. 52.94.83.4 1.0% 100 73.9 64.9 57.6 95.0 7.9
18. 52.94.82.255 0.0% 100 56.8 59.5 55.3 87.9 5.2
19. ???
20. ???
21. ???
22. ???
23. server-52-84-91-113.yul62.r.cloud 0.0% 100 56.3 58.2 54.9 92.5 5.4
75.75.75.75 (Comcast's DNS) resolved slack.com to 13.32.171.57 (dfw28s02-in-f14.1e100.net) in Dallas, 14 hops, ping average 22.2 ms.
[parse@word ~]$ dig +short A slack.com @75.75.75.75
13.32.171.57
[parse@word ~]$ mtr -c 100 13.32.171.57
Host Loss% Snt Last Avg Best Wrst StDev
1. router-external.home.lan 0.0% 100 1.2 2.4 0.8 30.2 5.0
2. 96.120.15.nnn 0.0% 100 11.4 12.1 9.6 35.7 3.2
3. 68.85.55.249 0.0% 100 19.8 12.6 9.4 37.7 4.6
4. be-92-ar02.dannythomas.tn.malt.co 0.0% 100 18.7 14.0 10.8 34.7 3.8
5. be-22258-cr02.dallas.tx.ibone.com 0.0% 100 24.1 23.8 20.9 37.7 3.1
6. be-12441-pe01.1950stemmons.tx.ibo 0.0% 100 21.2 22.8 19.8 53.6 4.7
7. 23.30.207.150 0.0% 100 29.2 24.5 19.8 66.6 7.0
8. 54.239.105.103 0.0% 100 64.5 33.9 20.5 88.8 10.2
9. ???
10. ???
11. ???
12. ???
13. ???
14. server-13-32-171-57.dfw54.r.cloud 0.0% 100 21.3 22.2 19.7 38.0 3.0
DNS server | Answer RR | City | Avg Latency
-------------|------------------|------------------|------------
1.1.1.1 | 52.222.216.88 | Minneapolis, MN | 50.0 ms
4.2.2.4 | 52.84.216.34 | St. Louis, MO | 36.0 ms
8.8.8.8 | 52.84.124.154 | Dulles, VA | 45.2 ms
9.9.9.9 | 52.84.91.113 | Montreal, QC | 58.2 ms
75.75.75.75 | 13.32.171.57 | Dallas, TX | 22.2 ms
Best results: 75.75.75.75
Worst results: 9.9.9.9