the last month it has been haashpower.co, prior to that it was through umine.co.uk (and another secret umine which suddenly disappeared with the coins) ... difficulty went from around 1 up to 14 after hashpower started mining, though. Also Cryptopia.co.nz mined a few blocks. But anyway, it is more spread out than it says on thhe site here.
Tagged hashpower.co & cryptopia, umine.co.uk stats where unavailable. Do not hesitate to report pools for tagging while they are active!
AdminFairglu (cryptoID owner, cryptoID) commented
If you know a block mined by umine, I can tag it
and look at Bolivar. They appear to be running the show today with 200 mhz through one miner alone. Hashpower dumped it like crazy.
Bolivar developer rented Umine for a couple ofmonths and it went up to about half of the mined blocks then the pool crashed and died before appearing again on an bare IP address (stratum+tcp://220.127.116.11:3982 for bolivar) and crashing and dying again. Now it is back at Umine (although a different IP from normal and no coins as such).