31.23.0.0/16

ip:	31.23.0.0 0.0.23.31.donpac.ru
loc:	Russia, Gorlovka (Rostov Oblast)  
isp:	AS12389 PJSC Rostelecom » BRAS Huawei ME60 (128kusers) » OJSC Rostelecom Macroregional Branch South 0.356 ms
route:	31.23.0.0/16, RU-RTK-20110328 - PJSC Rostelecom, RU (Rostov-on-Don) ... 
reg:	31.23.0.0/16, RU, RIPE, 2011-03-28
asn:	AS12389 - ROSTELECOM-AS PJSC Rostelecom, RU
addr:	  14 A Sinopskaya nabereznaya 191167 S.Peterburg RUSSIAN FEDERATION
online:	  35.947 » latency: 68 ms (122ms) 

see also:
   31.23.0.0/17     AS12389  MACROREGIONAL_SOUTH OJSC Rostelecom Macroregional Branch South, RU
   31.23.0.0/19     AS12389  MACROREGIONAL_SOUTH OJSC Rostelecom Macroregional Branch South, RU
   31.23.32.0/19    AS12389  MACROREGIONAL_SOUTH OJSC Rostelecom Macroregional Branch South, RU
   31.23.64.0/19    AS12389  MACROREGIONAL_SOUTH OJSC Rostelecom Macroregional Branch South, RU
   31.23.96.0/19    AS12389  MACROREGIONAL_SOUTH OJSC Rostelecom Macroregional Branch South, RU
   31.23.128.0/17   AS12389  MACROREGIONAL_SOUTH OJSC Rostelecom Macroregional Branch South, RU
   31.23.128.0/19   AS12389  MACROREGIONAL_SOUTH OJSC Rostelecom Macroregional Branch South, RU
   31.23.160.0/19   AS12389  MACROREGIONAL_SOUTH OJSC Rostelecom Macroregional Branch South, RU
   31.23.192.0/19   AS12389  MACROREGIONAL_SOUTH OJSC Rostelecom Macroregional Branch South, RU
   31.23.224.0/19   AS12389  MACROREGIONAL_SOUTH OJSC Rostelecom Macroregional Branch South, RU