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Public DNS Service Comparisons - slack.com

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

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

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

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

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

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

Summary

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

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