这里有一个ip地址为:47.90.78.76

地址栏输入:http://whois.arin.net/rest/ip/47.90.78.76.txt

查询结果为:

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#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2019, American Registry for Internet Numbers, Ltd.
#

NetRange: 47.90.0.0 - 47.90.127.255
CIDR: 47.90.0.0/17
NetName: ALICLOUD-HK
NetHandle: NET-47-90-0-0-1
Parent: AL-3 (NET-47-88-0-0-1)
NetType: Reassigned
OriginAS: AS45102
Customer: ALICLOUD-HK (C06961495)
RegDate: 2018-04-20
Updated: 2018-04-20
Comment: 1.For AliCloud IPR Infringement and Abuse Claim, please use below link with browser to report: https://intl.aliyun.com/report
Comment:
Comment: 2.For Alibaba.com and Aliexpress.com's IPR Infringement , please use below link with browser to report: https://ipp.alibabagroup.com
Comment:
Comment: 3.For Alibaba.com and Aliexpress.com's Abuse, please send email to those two mail lists to report: intl-abuse@list.alibaba-inc.com and abuse@alibaba-inc.com
Comment:
Comment: 4. For network issue, please send email to this mail list: aliops-goc@list.alibaba-inc.com
Ref: https://whois.arin.net/rest/net/NET-47-90-0-0-1

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2019, American Registry for Internet Numbers, Ltd.
#

可以看到该ip属于 47.90.0.0/17 地址块的,所以如果下面没有在划分,同样的主机有 2^15 个,所属状态是被分配,归属ALICLOUD-HK(香港阿里云)。这个地址块属于 AL-3 (NET-47-88-0-0-1),所以继续往上查询。

地址栏输入:http://whois.arin.net/rest/net/NET-47-88-0-0-1.txt

查询结果为:

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#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2019, American Registry for Internet Numbers, Ltd.
#

NetRange: 47.88.0.0 - 47.91.255.255
CIDR: 47.88.0.0/14
NetName: AL-3
NetHandle: NET-47-88-0-0-1
Parent: NET47 (NET-47-0-0-0-0)
NetType: Direct Allocation
OriginAS:
Organization: Alibaba.com LLC (AL-3)
RegDate: 2015-05-18
Updated: 2017-04-26
Ref: https://whois.arin.net/rest/net/NET-47-88-0-0-1

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2019, American Registry for Internet Numbers, Ltd.
#

可以看到前缀又变短了,这个地址块可以容纳 2^18 个主机,所属组织依然是阿里。继续往上查询

地址栏输入:http://whois.arin.net/rest/net/NET-47-0-0-0-0.txt

查询结果:

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#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2019, American Registry for Internet Numbers, Ltd.
#

NetRange: 47.0.0.0 - 47.255.255.255
CIDR: 47.0.0.0/8
NetName: NET47
NetHandle: NET-47-0-0-0-0
Parent: ()
NetType: Early Registrations, Maintained by ARIN
OriginAS:
Organization: American Registry for Internet Numbers (ARIN)
RegDate: 1989-01-06
Updated: 2012-02-29
Ref: https://whois.arin.net/rest/net/NET-47-0-0-0-0

#
# ARIN WHOIS data and services are subject to the Terms of Use
# available at: https://www.arin.net/resources/registry/whois/tou/
#
# If you see inaccuracies in the results, please report at
# https://www.arin.net/resources/registry/whois/inaccuracy_reporting/
#
# Copyright 1997-2019, American Registry for Internet Numbers, Ltd.
#

前缀变为8,也就是一个 A 类网络。所属于 ARIN,也就是美洲 internet 号码注册机构。