23528 SPARKPOST, US
Adjacency: 3 Upstream: 3 Downstream: 0
Upstream Adjacent AS list
AS3257 GTT-BACKBONE GTT, US
AS6939 HURRICANE, US
AS174 COGENT-174, US
Rank AS Type Originate Addr Space (pfx) Transit Addr space (pfx) Description 5130 AS23528 ORIGIN Originate: 35072 /16.90 Transit: 0 /0.00 SPARKPOST, 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 % 2661 AS23528 SPARKPOST, US 81 32 11 60 21 25.93% Prefix AS Path Aggregation Suggestion 91.206.59.0/24 3257 23528 103.11.244.0/24 6939 23528 137.22.224.0/22 6939 23528 + Announce - aggregate of 137.22.224.0/23 (6939 23528) and 137.22.226.0/23 (6939 23528) 137.22.224.0/24 6939 23528 - Withdrawn - aggregated with 137.22.225.0/24 (6939 23528) 137.22.225.0/24 6939 23528 - Withdrawn - aggregated with 137.22.224.0/24 (6939 23528) 137.22.226.0/24 6939 23528 - Withdrawn - aggregated with 137.22.227.0/24 (6939 23528) 137.22.227.0/24 6939 23528 - Withdrawn - aggregated with 137.22.226.0/24 (6939 23528) 137.22.228.0/24 6939 23528 137.22.229.0/24 3257 23528 137.22.230.0/23 3257 23528 + Announce - aggregate of 137.22.230.0/24 (3257 23528) and 137.22.231.0/24 (3257 23528) 137.22.230.0/24 3257 23528 - Withdrawn - aggregated with 137.22.231.0/24 (3257 23528) 137.22.231.0/24 3257 23528 - Withdrawn - aggregated with 137.22.230.0/24 (3257 23528) 137.22.232.0/21 6939 23528 + Announce - aggregate of 137.22.232.0/22 (6939 23528) and 137.22.236.0/22 (6939 23528) 137.22.232.0/24 6939 23528 - Withdrawn - aggregated with 137.22.233.0/24 (6939 23528) 137.22.233.0/24 6939 23528 - Withdrawn - aggregated with 137.22.232.0/24 (6939 23528) 137.22.234.0/24 6939 23528 - Withdrawn - aggregated with 137.22.235.0/24 (6939 23528) 137.22.235.0/24 6939 23528 - Withdrawn - aggregated with 137.22.234.0/24 (6939 23528) 137.22.236.0/24 6939 23528 - Withdrawn - aggregated with 137.22.237.0/24 (6939 23528) 137.22.237.0/24 6939 23528 - Withdrawn - aggregated with 137.22.236.0/24 (6939 23528) 137.22.238.0/24 6939 23528 - Withdrawn - aggregated with 137.22.239.0/24 (6939 23528) 137.22.239.0/24 6939 23528 - Withdrawn - aggregated with 137.22.238.0/24 (6939 23528) 137.22.240.0/22 3257 23528 + Announce - aggregate of 137.22.240.0/23 (3257 23528) and 137.22.242.0/23 (3257 23528) 137.22.240.0/24 3257 23528 - Withdrawn - aggregated with 137.22.241.0/24 (3257 23528) 137.22.241.0/24 3257 23528 - Withdrawn - aggregated with 137.22.240.0/24 (3257 23528) 137.22.242.0/24 3257 23528 - Withdrawn - aggregated with 137.22.243.0/24 (3257 23528) 137.22.243.0/24 3257 23528 - Withdrawn - aggregated with 137.22.242.0/24 (3257 23528) 137.22.244.0/24 3257 23528 137.22.247.0/24 6939 23528 137.22.248.0/23 6939 23528 + Announce - aggregate of 137.22.248.0/24 (6939 23528) and 137.22.249.0/24 (6939 23528) 137.22.248.0/24 6939 23528 - Withdrawn - aggregated with 137.22.249.0/24 (6939 23528) 137.22.249.0/24 6939 23528 - Withdrawn - aggregated with 137.22.248.0/24 (6939 23528) 137.22.250.0/24 6939 23528 147.160.155.0/24 6939 23528 147.253.208.0/20 6939 23528 147.253.220.0/23 3257 23528 147.253.222.0/24 3257 23528 156.70.2.0/23 6939 23528 156.70.4.0/23 6939 23528 156.70.12.0/23 6939 23528 156.70.16.0/23 3257 23528 156.70.22.0/23 6939 23528 156.70.24.0/23 6939 23528 156.70.34.0/23 3257 23528 156.70.46.0/23 6939 23528 156.70.52.0/23 6939 23528 156.70.62.0/23 6939 23528 156.70.72.0/23 6939 23528 + Announce - aggregate of 156.70.72.0/24 (6939 23528) and 156.70.73.0/24 (6939 23528) 156.70.72.0/24 6939 23528 - Withdrawn - aggregated with 156.70.73.0/24 (6939 23528) 156.70.73.0/24 6939 23528 - Withdrawn - aggregated with 156.70.72.0/24 (6939 23528) 156.70.76.0/23 6939 23528 156.70.88.0/23 3257 23528 156.70.116.0/23 6939 23528 156.70.120.0/23 6939 23528 156.70.150.0/23 6939 23528 161.129.25.0/24 6939 23528 161.129.27.0/24 6939 23528 161.199.112.0/24 6939 23528 162.247.166.0/24 6939 23528 162.247.167.0/24 3257 23528 168.203.32.0/22 6939 23528 + Announce - aggregate of 168.203.32.0/23 (6939 23528) and 168.203.34.0/23 (6939 23528) 168.203.32.0/23 6939 23528 - Withdrawn - aggregated with 168.203.34.0/23 (6939 23528) 168.203.34.0/23 6939 23528 - Withdrawn - aggregated with 168.203.32.0/23 (6939 23528) 168.203.36.0/23 6939 23528 168.203.42.0/23 3257 23528 168.203.46.0/23 3257 23528 168.203.48.0/22 6939 23528 168.203.52.0/24 6939 23528 192.133.16.0/24 6939 23528 192.158.253.0/24 6939 23528 192.174.80.0/20 6939 23528 192.174.92.0/24 3257 23528 192.174.94.0/23 3257 23528 + Announce - aggregate of 192.174.94.0/24 (3257 23528) and 192.174.95.0/24 (3257 23528) 192.174.94.0/24 3257 23528 - Withdrawn - aggregated with 192.174.95.0/24 (3257 23528) 192.174.95.0/24 3257 23528 - Withdrawn - aggregated with 192.174.94.0/24 (3257 23528) 194.28.204.0/23 3257 23528 199.15.224.0/23 6939 23528 + Announce - aggregate of 199.15.224.0/24 (6939 23528) and 199.15.225.0/24 (6939 23528) 199.15.224.0/24 6939 23528 - Withdrawn - aggregated with 199.15.225.0/24 (6939 23528) 199.15.225.0/24 6939 23528 - Withdrawn - aggregated with 199.15.224.0/24 (6939 23528) 199.15.226.0/23 3257 23528 216.24.61.0/24 6939 23528 223.165.112.0/24 3257 23528 223.165.114.0/24 3257 23528 223.165.116.0/23 6939 23528 + Announce - aggregate of 223.165.116.0/24 (6939 23528) and 223.165.117.0/24 (6939 23528) 223.165.116.0/24 6939 23528 - Withdrawn - aggregated with 223.165.117.0/24 (6939 23528) 223.165.117.0/24 6939 23528 - Withdrawn - aggregated with 223.165.116.0/24 (6939 23528) 223.165.122.0/23 6939 23528 + Announce - aggregate of 223.165.122.0/24 (6939 23528) and 223.165.123.0/24 (6939 23528) 223.165.122.0/24 6939 23528 - Withdrawn - aggregated with 223.165.123.0/24 (6939 23528) 223.165.123.0/24 6939 23528 - Withdrawn - aggregated with 223.165.122.0/24 (6939 23528) 223.165.124.0/24 6939 23528 223.165.125.0/24 3257 23528 223.165.126.0/24 6939 23528 223.165.127.0/24 3257 23528
Advertisements that are fragments of the original RIR allocation (more specifics) originated by this AS.
AS23528 31 More Specifics 55 Total Advertisements SPARKPOST, US
45.156.161.0/24 45.156.160.0/22
137.22.224.0/24 137.22.224.0/19
137.22.225.0/24 137.22.224.0/19
137.22.226.0/24 137.22.224.0/19
137.22.227.0/24 137.22.224.0/19
137.22.228.0/24 137.22.224.0/19
137.22.229.0/24 137.22.224.0/19
137.22.230.0/24 137.22.224.0/19
137.22.231.0/24 137.22.224.0/19
147.253.220.0/23 147.253.208.0/20
147.253.222.0/24 147.253.208.0/20
156.70.72.0/24 156.70.72.0/23
161.129.25.0/24 161.129.24.0/22
161.129.27.0/24 161.129.24.0/22
162.247.166.0/24 162.247.160.0/21
162.247.167.0/24 162.247.160.0/21
192.174.92.0/24 192.174.80.0/20
192.174.94.0/24 192.174.80.0/20
192.174.95.0/24 192.174.80.0/20
199.15.224.0/24 199.15.224.0/22
199.15.225.0/24 199.15.224.0/22
223.165.112.0/24 223.165.112.0/20
223.165.114.0/24 223.165.112.0/20
223.165.116.0/24 223.165.112.0/20
223.165.117.0/24 223.165.112.0/20
223.165.122.0/24 223.165.112.0/20
223.165.123.0/24 223.165.112.0/20
223.165.124.0/24 223.165.112.0/20
223.165.125.0/24 223.165.112.0/20
223.165.126.0/24 223.165.112.0/20
223.165.127.0/24 223.165.112.0/20
168.203.32.0/23 168.203.32.0/19
168.203.34.0/23 168.203.32.0/19
168.203.36.0/23 168.203.32.0/19
199.15.226.0/23 199.15.224.0/22
Prefixes added and withdrawn by this origin AS in the past 7 days.
- 168.203.32.0/23 Withdrawn
- 168.203.34.0/23 Withdrawn
- 168.203.36.0/23 Withdrawn
- 199.15.226.0/23 Withdrawn
whois: 402603
IANA has recorded AS23528 as originally allocated by
/usr/bin/whois -h jwhois.apnic.netr "AS23528\n
#
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# available at: https://www.arin.net/resources/registry/whois/tou/
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ASNumber: 23528
ASName: SPARKPOST
ASHandle: AS23528
RegDate: 2018-04-16
Updated: 2018-04-16
Ref: https://rdap.arin.net/registry/autnum/23528
OrgName: Bird.com Inc.
OrgId: MS-820
Address: 4701 Sangamore Road suite 100N-139
City: Bethesda
StateProv: MD
PostalCode: 20816
Country: US
RegDate: 2015-12-09
Updated: 2025-08-14
Ref: https://rdap.arin.net/registry/entity/MS-820
OrgAbuseHandle: SEA25-ARIN
OrgAbuseName: SparkPost Elite Abuse
OrgAbusePhone: +1-410-872-4910
OrgAbuseEmail: abuse@sparkpostelite.com
OrgAbuseRef: https://rdap.arin.net/registry/entity/SEA25-ARIN
OrgTechHandle: PILLA10-ARIN
OrgTechName: Pillai, Balasubramania
OrgTechPhone: +1-410-953-9519
OrgTechEmail: balu.pillai@messagebird.com
OrgTechRef: https://rdap.arin.net/registry/entity/PILLA10-ARIN
OrgTechHandle: PARMA32-ARIN
OrgTechName: Parman, Tyler
OrgTechPhone: +1-415-578-5222
OrgTechEmail: tyler.parman@bird.com
OrgTechRef: https://rdap.arin.net/registry/entity/PARMA32-ARIN
OrgRoutingHandle: PARMA32-ARIN
OrgRoutingName: Parman, Tyler
OrgRoutingPhone: +1-415-578-5222
OrgRoutingEmail: tyler.parman@bird.com
OrgRoutingRef: https://rdap.arin.net/registry/entity/PARMA32-ARIN
OrgDNSHandle: PARMA32-ARIN
OrgDNSName: Parman, Tyler
OrgDNSPhone: +1-415-578-5222
OrgDNSEmail: tyler.parman@bird.com
OrgDNSRef: https://rdap.arin.net/registry/entity/PARMA32-ARIN
OrgTechHandle: MATTR5-ARIN
OrgTechName: Mattrat, Felix
OrgTechPhone: +3000000000
OrgTechEmail: felix@bird.com
OrgTechRef: https://rdap.arin.net/registry/entity/MATTR5-ARIN
OrgNOCHandle: SEA25-ARIN
OrgNOCName: SparkPost Elite Abuse
OrgNOCPhone: +1-410-872-4910
OrgNOCEmail: abuse@sparkpostelite.com
OrgNOCRef: https://rdap.arin.net/registry/entity/SEA25-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/
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# Copyright 1997-2026, American Registry for Internet Numbers, Ltd.
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