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adsl2.static.versatel.nl are subdomains to this hostname. versatel.nl is a domain controlled by two nameservers on different IP networks. Incoming mail for versatel.nl is handled by six mailservers at versatel.nl themselves. All of them are on the same IP network. versatel.nl has one IP number.

versatel.nl
a records
 
+ 62.58.50.202 62.58.0.0/15 AS13127  
+ ---  
ns-soa records
ns.versatel.nl
+ 62.58.50.4 62.58.0.0/15 AS13127 -
+ --- -
ns records
ns.vuurwerk.nl
+ 62.250.2.2 62.250.0.0/16 AS13127 santpoort.vuurwerk.nl
+ --- santpoort.vuurwerk.nl
ns.versatel.nl
+ 62.58.50.4 62.58.0.0/15 AS13127 -
+ --- -
mx records
mail1.versatel.nl
+ 62.58.50.83 62.58.0.0/15 AS13127 -
+ --- -
mail2.versatel.nl
+ 62.58.50.84 62.58.0.0/15 AS13127 -
mail3.versatel.nl
+ 62.58.50.86 62.58.0.0/15 AS13127 -
mail4.versatel.nl
+ 62.58.50.87 62.58.0.0/15 AS13127 -
mail5.versatel.nl
+ 62.58.50.105 62.58.0.0/15 AS13127 -
mail6.versatel.nl
+ 62.58.50.111 62.58.0.0/15 AS13127 -
subdomains
adsl2.static.versatel.nl