There are numerous possible reasons for this. RedemptionPeriod is not necessarily supported by all registrars verbatim, others call it the "On Hold" time period, and still others call it a "Pending delete". Each lookup service has its own policies regarding status of this type, some allow auctions to bid for it once the window expires, others set a baseline fee, etc. Also, DNS in general is not stored in one central repository or server. Lots of domain listings are cached in local proxies and it not everthing is in perfect sync when time sensitive records get updated so the time period itself might not be the same. The only status that matters is from the database of the registrar who hosts the domain currently.
-jim
ps: If you ever want to see the zone file for a given domain, i.e. to determine if the zone was ever setup at all...
1) Go to whois.com to find out the primary nameserver name.
2) In your terminal (shell) type in:
dig @ns1.name_server_name.com thedomain.com in axfr
Substitute ns1.name_server_name.com for the primary nameserver name and thedomain.com with the name of the domain you are researching.
Example results for macrumors.com:
[3] [root $] [~] > dig @ns1.tecknohost.com macrumors.com in axfr
; <<>> DiG 9.2.4 <<>> @ns1.tecknohost.com macrumors.com in axfr
; (1 server found)
;; global options: printcmd
macrumors.com. 3600 IN SOA ns2.tecknohost.com. support.tecknohost.com. 207 86400 3600 2419200 86400
macrumors.com. 720 IN MX 40 macrumors.com.
macrumors.com. 720 IN A 74.86.132.180
macrumors.com. 3600 IN NS d3.tecknohost.com.
macrumors.com. 3600 IN NS ns1.tecknohost.com.
macrumors.com. 3600 IN NS ns2.tecknohost.com.
att.macrumors.com. 3600 IN A 74.86.225.88
beta.macrumors.com. 3600 IN A 74.86.132.180
buyersguide.macrumors.com. 3600 IN A 74.86.132.180
emac.macrumors.com. 3600 IN A 74.86.132.180
feeds.macrumors.com. 3600 IN CNAME feeds.feedburner.com.
forums.macrumors.com. 720 IN A 74.86.210.200
forums.macrumors.com. 720 IN A 74.86.227.40
ftp.macrumors.com. 3600 IN CNAME macrumors.com.
guides.macrumors.com. 3600 IN A 74.86.225.88
ibook.macrumors.com. 3600 IN A 74.86.132.180
imac.macrumors.com. 3600 IN A 74.86.132.180
images.macrumors.com. 720 IN A 74.86.132.183
iphone.macrumors.com. 3600 IN A 74.86.132.180
ipod.macrumors.com. 3600 IN A 74.86.132.180
itunes.macrumors.com. 3600 IN A 74.86.132.180
jobs.macrumors.com. 3600 IN CNAME customdomainname.jobthread.com.
localhost.macrumors.com. 3600 IN A 127.0.0.1
macbook.macrumors.com. 3600 IN A 74.86.132.180
macbookpro.macrumors.com. 3600 IN A 74.86.132.180
macmini.macrumors.com. 3600 IN A 74.86.132.180
macpro.macrumors.com. 3600 IN A 74.86.132.180
mirror.macrumors.com. 60 IN A 67.202.47.166
mirror.macrumors.com. 60 IN A 75.101.196.117
mirror.macrumors.com. 60 IN A 75.101.246.22
mobile.macrumors.com. 3600 IN A 74.86.132.180
page2.macrumors.com. 3600 IN A 74.86.132.180
powerbook.macrumors.com. 3600 IN A 74.86.132.180
powermac.macrumors.com. 3600 IN A 74.86.132.180
shop.macrumors.com. 3600 IN A 74.86.132.180
spy.macrumors.com. 3600 IN A 74.86.225.88
summaries.macrumors.com. 3600 IN A 74.86.132.180
wap.macrumors.com. 3600 IN A 74.86.132.180
www.macrumors.com. 720 IN CNAME macrumors.com.
xserve.macrumors.com. 3600 IN A 74.86.132.180
macrumors.com. 3600 IN SOA ns2.tecknohost.com. support.tecknohost.com. 207 86400 3600 2419200 86400
;; Query time: 64 msec
;; SERVER: 75.125.164.34#53(75.125.164.34)
;; WHEN: Mon Feb 9 09:36:39 2009
;; XFR size: 41 records