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Sorry, we have no information about network.nifty.org. nifty.org is a domain controlled by two nameservers at lightning.net. They are on the same IP network. Incoming mail for nifty.org is handled by two mailservers at emailsrvr.com. They are on different IP networks. nifty.org has one IP number.

nifty.org
a records
 
+ 209.51.164.91 209.51.160.0/19 AS6939  
+ ---  
ns-soa records
thunder.lightning.net
+ 209.51.160.2 209.51.160.0/19 AS6939 ns1.nyc.he.net
+ --- ns1.nyc.he.net
ns records
storm.lightning.net
+ 209.51.180.102 209.51.160.0/19 AS6939 ns2.nyc.he.net
+ --- ns2.nyc.he.net
thunder.lightning.net
+ 209.51.160.2 209.51.160.0/19 AS6939 ns1.nyc.he.net
+ --- ns1.nyc.he.net
mx records
mx1.emailsrvr.com
+ 72.4.117.21 72.4.112.0/20 AS27357 -
+ --- -
mx2.emailsrvr.com
+ 98.129.185.132 98.129.0.0/16 AS33070 -
ip numbers using ptr to this host
209.51.164.88