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How are upstreams and downstreams calculated?

Upstreams

	ASN	Description
	AS7018	AT&T Services, Inc.
	AS3786	LG DACOM Corporation
	AS9318	SK Broadband Co Ltd
	AS6453	TATA COMMUNICATIONS (AMERICA) INC
	AS3356	Lumen (Level 3)

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Peers

	ASN	Description
	AS9002	RETN Limited
	AS38008	Aperture Science Limited
	AS36236	NetActuate, Inc
	AS48024	NEROCLOUD LTD
	AS7018	AT&T Services, Inc.
	AS4635	Hong Kong Internet Exchange--Route Server 1
	AS3786	LG DACOM Corporation
	AS6453	TATA COMMUNICATIONS (AMERICA) INC
	AS3356	Lumen (Level 3)
	AS9318	SK Broadband Co Ltd

% [whois.apnic.net]
% Whois data copyright terms    http://www.apnic.net/db/dbcopyright.html

% Information related to '157.197.0.0 - 157.197.255.255'

% Abuse contact for '157.197.0.0 - 157.197.255.255' is 'irt@nic.or.kr'

inetnum:        157.197.0.0 - 157.197.255.255
netname:        SAMSUNGSDS
descr:          SamsungSDS Inc.
admin-c:        IM685-AP
tech-c:         IM685-AP
country:        KR
status:         ALLOCATED PORTABLE
mnt-by:         MNT-KRNIC-AP
mnt-irt:        IRT-KRNIC-KR
last-modified:  2017-02-02T06:54:42Z
source:         APNIC

irt:            IRT-KRNIC-KR
address:        Jeollanam-do Naju-si Jinheung-gil
e-mail:         irt@nic.or.kr
abuse-mailbox:  irt@nic.or.kr
admin-c:        IM574-AP
tech-c:         IM574-AP
auth:           # Filtered
remarks:        irt@nic.or.kr was validated on 2020-04-09
mnt-by:         MNT-KRNIC-AP
last-modified:  2021-06-15T06:21:49Z
source:         APNIC

person:         IP Manager
address:        Seoul Songpa-gu Olympic-ro 35-gil 125
country:        KR
phone:          +82-2-509-0026
e-mail:         ipmanager@samsung.com
nic-hdl:        IM685-AP
mnt-by:         MNT-KRNIC-AP
last-modified:  2019-09-02T00:36:04Z
source:         APNIC

% Information related to '157.197.0.0 - 157.197.255.255'

inetnum:        157.197.0.0 - 157.197.255.255
netname:        SAMSUNGSDS-KR
descr:          SamsungSDS Inc.
country:        KR
admin-c:        I11-KR
tech-c:         HK11-KR
status:         ALLOCATED PORTABLE
mnt-by:         MNT-KRNIC-AP
mnt-irt:        IRT-KRNIC-KR
remarks:        This information has been partially mirrored by APNIC from
remarks:        KRNIC. To obtain more specific information, please use the
remarks:        KRNIC whois server at whois.kisa.or.kr.
changed:        hostmaster@nic.or.kr
source:         KRNIC

person:         IP Manager
address:        Seoul Songpa-gu Olympic-ro 35-gil 125
address:        (sincheondong, SamsungSDS)
country:        KR
phone:          +82-2-509-0026
e-mail:         ipmanager@samsung.com
nic-hdl:        HK11-KR
mnt-by:         MNT-KRNIC-AP
changed:        hostmaster@nic.or.kr
source:         KRNIC

person:         IP Manager
address:        Seoul Songpa-gu Olympic-ro 35-gil 125
address:        (sincheondong, SamsungSDS)
country:        KR
phone:          +82-2-509-0026
e-mail:         ipmanager@samsung.com
nic-hdl:        I11-KR
mnt-by:         MNT-KRNIC-AP
changed:        hostmaster@nic.or.kr
source:         KRNIC

% This query was served by the APNIC Whois Service version 1.88.16 (WHOIS-UK4)

Last Update: 2023-01-07T17:03:58Z UTC