(OT) Anybody being pinged consistently by these systems?

[Greg Thomas <getbsd@sbcglobal.net>]

Feb 06 13:56:27.960373 rule 12/0(match): block in on xl0: 63.251.62.70 
 > 67.112.95.42: icmp: echo request (DF)
Feb 06 13:59:41.086721 rule 12/0(match): block in on xl0: 63.251.62.74 
 > 67.112.95.42: icmp: echo request (DF)
Feb 06 14:02:08.186271 rule 12/0(match): block in on xl0: 63.251.62.73 
 > 67.112.95.42: icmp: echo request (DF)
Feb 06 14:04:24.612426 rule 12/0(match): block in on xl0: 63.251.62.72 
 > 67.112.95.42: icmp: echo request (DF)
Feb 06 14:15:15.768784 rule 12/0(match): block in on xl0: 63.251.62.71 
 > 67.112.95.42: icmp: echo request (DF)
Feb 06 14:35:06.472441 rule 12/0(match): block in on xl0: 63.251.62.75 
 > 67.112.95.42: icmp: echo request (DF)
Feb 06 14:44:26.806970 rule 12/0(match): block in on xl0: 63.251.62.68 
 > 67.112.95.42: icmp: echo request (DF)
Feb 06 14:46:18.721934 rule 12/0(match): block in on xl0: 63.251.62.67 
 > 67.112.95.42: icmp: echo request (DF)
Feb 06 14:47:54.935447 rule 12/0(match): block in on xl0: 63.251.62.65 
 > 67.112.95.42: icmp: echo request (DF)
Feb 06 14:50:55.142543 rule 12/0(match): block in on xl0: 63.251.62.69 
 > 67.112.95.42: icmp: echo request (DF)

Before I go back to not blocking icmp I was just wondering if anyone 
else gets pinged by this group of IPs every 5 to 10 minutes? It appears 
to be a performance monitor at InterNAP but I was just curious as to 
why they'd be checking my puny ADSL line.

Greg