pings from research.*.pnap.net

anyone knows what this organization is? i receive pings from them periodically.

01:27:44.884618 research.dal.pnap.net > my1.doubleukay.com: icmp: echo request (DF)
01:27:44.884688 my1.doubleukay.com > research.dal.pnap.net: icmp: echo reply
01:27:47.994721 research.dal.pnap.net > my1.doubleukay.com: icmp: echo request (DF)
01:27:47.994782 my1.doubleukay.com > research.dal.pnap.net: icmp: echo reply

 

 

 

 

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