18731 CITYSIDE-01 - Cityside Fiber, US
Adjacency: 2 Upstream: 2 Downstream: 0
Upstream Adjacent AS list
AS6461 ZAYO-6461 - Zayo Bandwidth, US
AS3356 LEVEL3 - Level 3 Parent, LLC, US
Rank AS Type Originate Addr Space (pfx) Transit Addr space (pfx) Description 48438 AS18731 ORIGIN Originate: 512 /23.00 Transit: 0 /0.00 CITYSIDE-01 - Cityside Fiber, US
Aggregation Suggestions
Filter: Aggregates, Specifics
This report does not take into account conditions local to each origin AS in terms of policy or traffic engineering requirements, so this is an approximate guideline as to aggregation possibilities.
Rank AS AS Name Current Wthdw Aggte Annce Redctn % 35294 AS18731 CITYSIDE-01 - Cityside Fiber, US 2 0 0 2 0 0.00% Prefix AS Path Aggregation Suggestion 23.164.40.0/24 4777 2516 3356 18731 128.177.138.0/24 4777 2497 6461 18731
Advertisements that are fragments of the original RIR allocation (more specifics) originated by this AS.
AS18731 1 More Specifics 2 Total Advertisements CITYSIDE-01 - Cityside Fiber, US
128.177.138.0/24 128.177.0.0/16
whois: 402332
IANA has recorded AS18731 as originally allocated by
/usr/bin/whois -h jwhois.apnic.netr "AS18731\n
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ASNumber: 18731
ASName: CITYSIDE-01
ASHandle: AS18731
RegDate: 2023-10-12
Updated: 2023-10-12
Comment: http://www.citysidefiber.com
Comment: NOC hours
Comment: 07:00 to 16:00 PST
Ref: https://rdap.arin.net/registry/autnum/18731
OrgName: Cityside Fiber
OrgId: CNL-178
Address: 100 Spectrum Center Dr suite 500
City: Irvine
StateProv: CA
PostalCode: 92618
Country: US
RegDate: 2023-10-05
Updated: 2025-05-12
Ref: https://rdap.arin.net/registry/entity/CNL-178
OrgNOCHandle: PELAG1-ARIN
OrgNOCName: Pelagio, Raul
OrgNOCPhone: +1-877-914-2489
OrgNOCEmail: noc@citysidefiber.com
OrgNOCRef: https://rdap.arin.net/registry/entity/PELAG1-ARIN
OrgTechHandle: SIMON405-ARIN
OrgTechName: Simon, Jacob
OrgTechPhone: +1-727-599-9912
OrgTechEmail: jake.simon@citysidenetworks.com
OrgTechRef: https://rdap.arin.net/registry/entity/SIMON405-ARIN
OrgAbuseHandle: PELAG1-ARIN
OrgAbuseName: Pelagio, Raul
OrgAbusePhone: +1-877-914-2489
OrgAbuseEmail: noc@citysidefiber.com
OrgAbuseRef: https://rdap.arin.net/registry/entity/PELAG1-ARIN
OrgAbuseHandle: SIMON405-ARIN
OrgAbuseName: Simon, Jacob
OrgAbusePhone: +1-727-599-9912
OrgAbuseEmail: jake.simon@citysidenetworks.com
OrgAbuseRef: https://rdap.arin.net/registry/entity/SIMON405-ARIN
OrgDNSHandle: MOORE1860-ARIN
OrgDNSName: Moore, Logan
OrgDNSPhone: +1-309-267-8574
OrgDNSEmail: logan.moore@citysidefiber.com
OrgDNSRef: https://rdap.arin.net/registry/entity/MOORE1860-ARIN
OrgTechHandle: MOORE1860-ARIN
OrgTechName: Moore, Logan
OrgTechPhone: +1-309-267-8574
OrgTechEmail: logan.moore@citysidefiber.com
OrgTechRef: https://rdap.arin.net/registry/entity/MOORE1860-ARIN
OrgDNSHandle: SIMON405-ARIN
OrgDNSName: Simon, Jacob
OrgDNSPhone: +1-727-599-9912
OrgDNSEmail: jake.simon@citysidenetworks.com
OrgDNSRef: https://rdap.arin.net/registry/entity/SIMON405-ARIN
OrgRoutingHandle: MOORE1860-ARIN
OrgRoutingName: Moore, Logan
OrgRoutingPhone: +1-309-267-8574
OrgRoutingEmail: logan.moore@citysidefiber.com
OrgRoutingRef: https://rdap.arin.net/registry/entity/MOORE1860-ARIN
OrgRoutingHandle: SIMON405-ARIN
OrgRoutingName: Simon, Jacob
OrgRoutingPhone: +1-727-599-9912
OrgRoutingEmail: jake.simon@citysidenetworks.com
OrgRoutingRef: https://rdap.arin.net/registry/entity/SIMON405-ARIN
OrgNOCHandle: SIMON405-ARIN
OrgNOCName: Simon, Jacob
OrgNOCPhone: +1-727-599-9912
OrgNOCEmail: jake.simon@citysidenetworks.com
OrgNOCRef: https://rdap.arin.net/registry/entity/SIMON405-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.
#