On May 14th 2019, Thousand Eyes reported that China Telecom suffered a major outage for several hours starting at 12:30 PM PDT on May 13th (this corresponds to 7:30pm UTC). See the report Internet Outage Reveals Reach of China's Connectivity

Looking at the PingER monitoring data (which is available on an hourly basis), for example see http://www-wanmon.slac.stanford.edu/cgi-wrap/pingtable.pl?file=packet_loss&by=by-node&size=100&tick=hourly&year=2019&month=05&day=13&column=3&from=EDU.SLAC.STANFORD.PINGER&to=China&ex=none&only=all&ipv=all&dataset=hep&percentage=any between 00:00 and 19:59 the number of hosts with zero packet loss is 140+-2. Then between 20:00 and 21:00 UTC it drops precipitously to 115 and climbs back up to 142 by the hour of 01:00-02:00 UTC.

The hosts that are impacted starting at the hour 19:00 - 20:00 5/13/2019 UTC are:


HostRecovered by hour of 22:00 5/13/2019 UTCRecovered by hour of 00:01 5/14/2015 UTCLocationLat Long
www.bbc.edu.cn Yes
Bengbu City, Anhui Province, Cao Hill Road, 1866 Zip: 233030
32.9408 117.3608
Hangzhou, Zhejiang Province, China
30.2434 120.1605
www.cslg.edu.cn Yes
Changshu, Jiangsu215500, China
31.5882 120.7780
www.cuhk.edu.cnYes Hong Kong, Shenzhen
22.5455 114.0683
Nanchang, Jianxi, China Postcode: 330013
28.7383 115.8726 
www.zmc.gz.cnYes  Zhuhai, Guizhou 22.2789 113.5678
www.hbmy.edu.cn Yes
Enshi, Hubei Province, China, Post Code:  445000
30.4918 114.3960
Yuelu District, Changsha City, Hunan Province
28.1969 112.8802
Xiangtan, Hunan
 27.8450 112.9328
www.hnist.cn Yes Yueyang City, Hunan Province School Road, China Post Code: 414006 29.3410 113.1478
www.huas.cn Yes Changde, P.R.China 29.0464 111.6724
www.huat.edu.cn Yes Shiyan City, Hubei, P.R.China 30.4832 114.3072
www.huse.cn Yes
Yongzhou City, Hunan Province, China Post Code: 425199
26.2063 111.6093
Jishou City, Hunan Province, China Post Code: 416000
28.2870 109.7219
www.kmmc.cnYes  Kunming Yunnan Province, China Post code 650500 25.0441 102.6869
www.shmtu.edu.cn Yes
Shanghai,P.R.China Post Code 201306
 31.0456 121.3997
www.sspu.edu.cnYes  Pudong District,Shanghai,China Post Code:201209 31.0456 121.3997
www.stu.edu.cn Yes
Shantou, Guangdong
23.4111 116.6399
www.usc.edu.cn Yes
Hengyang City, No. 28, China Post Code: 421
26.8992 112.5903
Zhejiang,China Post Code 315100
29.8173 121.5584
www.ylu.cnYes (recovered hour of 21:00 - 22:00) 
Yulin, Guangxi road No. 299, China, Post Code: 537000
22.6405 110.1635

The spreadsheet of the data is here. There are several tabs.


There is a map of the PingER hosts in this region below. The map can be reached via: http://wanmon.slac.stanford.edu/wan-mon/viper/pinger-coverage-gmap.html

And below are the locations of impacted hosts. Green did not recover until 5/14/2019, blue recovered by the hour of 22:00 5/13/2019.  This map used https://app.mapline.com/map/map_259b1add

And below is a map of the Good hosts (dark blue) and the impacted hosts (light blue). It appears the impacted hosts appear to be mainly in South Western China.

ProvinceImpacted hostsNot Impacted hosts
Anhui1a lot




Traceroutes to all the non-impacted hosts are hereTraceroutes to all the impacted hosts (run on 5/16/2019) are here. The first 11 impacted hosts recovered in the hour of 21:00 - 22:00  2019 UTC.  The traceroutes get to chinanet-backbone-as4134 between hops 9 and 11. After that note that the addresses for the next 5 hops are in the ranges thru  and thru These belong to the Chinanet Backbone network of China Telecom (see https://mxtoolbox.com/SuperTool.aspx?action=arin%3a202.97.62.5&run=toolpage). After that they transition to the province networks, e.g. Beijing Hubei province, Jiangsu province etc.

Also note that ASN 4137 belongs to Chinanet (see https://www.ultratools.com/tools/asnInfoResult?domainName=4134&as_sfid=AAAAAAVALxmsrUhVGnsSjSMLm23WvwxRgORWEQg508YJztWdwV9rFCX_l05CuKv1WUZriwMGrH4CKGCZPhj7srzd--Zt9XDR8_zPlnJhNC-YA29bcHj-ajNXkKNWhU_P1Jcco0M%3D&as_fid=6f6eb984403977b9aa80b229654cca47dbc2f6f8).



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