AS23528 — SPARKPOST
Network type: hosting
AS23528 announces 45 IPv4 prefixes covering 33,024 addresses and 0 IPv6 prefixes.
About this network
The AS handle SPARKPOST is held by Bird.com Inc.
What it's used for
- The address space carries email infrastructure, evidenced by reverse DNS entries such as mta-253-212-0.sparkpostmail.com and mta-82-0.sparkpostmail.com.
- The AS announces 33024 IPv4 addresses across 49 prefixes with only 4 observed neighbours, indicating a dedicated service network rather than a transit provider.
Notable
- Registrants include both Bird.com Inc. (netnames MS-820, NET-199-15-224-0-1) and Braze, inc (netname BRAZE-7), reflecting the corporate history of the platform.
- Bird.com was formerly known as SparkPost, a major email delivery service that was acquired by Braze in 2021.
- The inventory consists of a mix of /20, /21, /22, and /23 blocks, with a significant portion of the /23s under the MS-820 netname.
This description is AI-generated, best-effort context — not authoritative, and provided without any guarantee of accuracy.
Announced prefixes
- 91.206.59.0/24
- 137.22.224.0/20
- 137.22.240.0/22
- 137.22.244.0/24
- 137.22.247.0/24
- 137.22.248.0/23
- 137.22.250.0/24
- 147.160.155.0/24
- 147.253.208.0/20
- 156.70.2.0/23
- 156.70.4.0/23
- 156.70.12.0/23
- 156.70.16.0/23
- 156.70.22.0/23
- 156.70.24.0/23
- 156.70.34.0/23
- 156.70.46.0/23
- 156.70.52.0/23
- 156.70.62.0/23
- 156.70.72.0/23
- 156.70.76.0/23
- 156.70.88.0/23
- 156.70.120.0/23
- 156.70.150.0/23
- 161.129.25.0/24
- 161.129.27.0/24
- 161.199.112.0/24
- 162.247.166.0/23
- 168.203.32.0/22
- 168.203.36.0/23
- 168.203.42.0/23
- 168.203.46.0/23
- 168.203.48.0/22
- 168.203.52.0/23
- 192.133.16.0/24
- 192.158.253.0/24
- 192.174.80.0/20
- 194.28.204.0/23
- 199.15.224.0/22
- 216.24.61.0/24
- 223.165.112.0/24
- 223.165.114.0/24
- 223.165.116.0/23
- 223.165.122.0/23
- 223.165.124.0/22
Upstream networks
Adjacent networks
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IPv4 Prefixes
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IPv6 Prefixes
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Total Prefixes
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Unique /24s
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⚠ SUSPICIOUS PREFIX ANNOUNCEMENTS DETECTED