ASN AS10255 is an Autonomous System Number used to identify a network for BGP internet routing.

Who manages ASN AS10255?

AS10255 is listed under Sinister and Solitary.

What do peers, upstreams, and downstreams mean in ASN data?

Peers are lateral network interconnections, upstreams are transit providers, and downstreams are customer networks receiving connectivity.

What are routes and IP ranges for an ASN?

Routes and IP ranges are the network prefixes announced by the ASN on the internet and show the address space it originates.

Why is WHOIS data shown for an ASN?

WHOIS data provides registration and contact context for ASN ownership, administration, and operational reference.

How can I access the full ASN tables?

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AS10255 Sinister and Solitary

ASN Lookup Tool

Sinister and Solitary sinister.com

US 9 Routes

AS Data

AS10255

AS10255 – Sinister and Solitary

AS Number	10255
AS Name	SINISTER
Organization	Sinister and Solitary (sinist-2)
Country	US
Website	sinister.com
Number of IPv4 Routes	7
Number of IPv6 Routes	2
ASN type	ISP
Registry	ARIN
Date Allocated	1997-05-23

ASN Intelligence API for production workflows

Use ASN data for AS10255 in automation: routing intelligence, peering analysis, ownership checks, and network observability.

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IP Ranges

Route	Origin	Origin Name	ISP	# IPs
204.69.206.0/24	AS10255	Sinister and Solitary	The Tesseract Group, Inc.	256
192.31.227.0/24	AS10255	Sinister and Solitary	Left Bank Operation	256
198.49.250.0/24	AS10255	Sinister and Solitary	Island Computer Consultants	256
2605:6c00:9::/48	AS10255	Sinister and Solitary	CoreSite	~1×10²⁴
199.74.249.0/24	AS10255	Sinister and Solitary	dao Consulting, LLC	256
199.201.145.0/24	AS10255	Sinister and Solitary	L0pht Heavy Industries	256
199.204.152.0/22	AS10255	Sinister and Solitary	CAMBRIDGE BANDWIDTH CONSORTIUM, INC.	1024
2620:131:f000::/40	AS10255	Sinister and Solitary	CAMBRIDGE BANDWIDTH CONSORTIUM, INC.	~309×10²⁴
204.107.200.0/24	AS10255	Sinister and Solitary	Derek Atkins, Sole Proprietorship	256

Raw Whois Response

#
# 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 1997-2026, American Registry for Internet Numbers, Ltd.
#


ASNumber:       10255
ASName:         SINISTER
ASHandle:       AS10255
RegDate:        1997-05-23
Updated:        1997-05-23
Ref:            https://rdap.arin.net/registry/autnum/10255


OrgName:        Sinister and Solitary
OrgId:          SINIST-2
Address:        c/o Robert Keyes
Address:        102 Greenville Rd.
City:           Monson
StateProv:      ME
PostalCode:     04464
Country:        US
RegDate:        1997-05-23
Updated:        2021-12-27
Ref:            https://rdap.arin.net/registry/entity/SINIST-2


OrgAbuseHandle: SH91-ORG-ARIN
OrgAbuseName:   Sinister Hostmaster
OrgAbusePhone:  +1-443-637-2870 
OrgAbuseEmail:  bob@sinister.com
OrgAbuseRef:    https://rdap.arin.net/registry/entity/SH91-ORG-ARIN

OrgTechHandle: SH91-ORG-ARIN
OrgTechName:   Sinister Hostmaster
OrgTechPhone:  +1-443-637-2870 
OrgTechEmail:  bob@sinister.com
OrgTechRef:    https://rdap.arin.net/registry/entity/SH91-ORG-ARIN

RTechHandle: SH91-ORG-ARIN
RTechName:   Sinister Hostmaster
RTechPhone:  +1-443-637-2870 
RTechEmail:  bob@sinister.com
RTechRef:    https://rdap.arin.net/registry/entity/SH91-ORG-ARIN


#
# 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 1997-2026, American Registry for Internet Numbers, Ltd.
#

Parsed Whois Response

{
  "status" : true,
  "whois_server" : "whois.arin.net",
  "aut_nums" : [ {
    "aut_num" : "10255",
    "as_handle" : "AS10255",
    "as_name" : "SINISTER",
    "tech_contacts" : [ "SH91-ORG-ARIN", "SH91-ORG-ARIN" ],
    "abuse_contacts" : [ "SH91-ORG-ARIN" ],
    "date_created" : "1997-05-23",
    "date_updated" : "1997-05-23",
    "source" : "https://rdap.arin.net/registry/autnum/10255"
  } ],
  "organization" : {
    "handle" : "SINIST-2",
    "name" : "Sinister and Solitary",
    "address" : [ "c/o Robert Keyes", "102 Greenville Rd.", "Monson", "ME", "04464", "US" ],
    "street" : "Greenville Rd.",
    "city" : "Monson",
    "state" : "ME",
    "zip_code" : "04464",
    "country" : [ "US" ],
    "date_created" : "1997-05-23",
    "date_updated" : "2021-12-27",
    "source" : "https://rdap.arin.net/registry/entity/SINIST-2",
    "addressCountry" : "US"
  },
  "technical_contacts" : [ {
    "handle" : "SH91-ORG-ARIN",
    "name" : "Sinister Hostmaster",
    "email" : [ "bob@sinister.com" ],
    "phone" : [ "+1-443-637-2870" ],
    "source" : "https://rdap.arin.net/registry/entity/SH91-ORG-ARIN"
  } ],
  "abuse_contacts" : [ {
    "handle" : "SH91-ORG-ARIN",
    "name" : "Sinister Hostmaster",
    "email" : [ "bob@sinister.com" ],
    "phone" : [ "+1-443-637-2870" ],
    "source" : "https://rdap.arin.net/registry/entity/SH91-ORG-ARIN"
  } ]
}

Peers

AS Number	Description	Country
AS2734	CoreSite	US
AS401988	5005 LLC	US

Upstreams

AS Number	Description	Country
AS2734	CoreSite	US

Downstreams

AS Number	Description	Country
AS401988	5005 LLC	US