AS19704Howard Center, Inc.
United StatesRegistryARINAs of 11th November 2026, AS19704 (Howard Center, Inc.), a network registered in the United States with ARIN, originates 2 IPv4 prefixes covering 512 addresses and 2 IPv6 prefixes. By IPv4 address space that makes it the 49,320th-largest of the 80,747 networks we see originating IPv4, and the 10,557th-largest of 18,752 in the United States. It is seen behind 2 upstream networks, most often AS13536 (FirstLight Networks, LLC) and AS7015 (Comcast Cable Communications, LLC). Every one of its announcements has a valid RPKI ROA, and none are RPKI-invalid. 100% of its routes reach at least 90% of full-feed peers.
At a glance
IPv4 prefixes
IPv6 prefixes
IPv4 addresses
IPv6 /64s
Upstream graph
The networks AS19704 is seen behind, one and two hops out, drawn from real AS paths.
Networks observed one and two hops upstream of AS19704 in real AS paths. A thicker line means more vantage points saw that adjacency, so weight tracks how well attested it is — not how much traffic it carries. Adjacency is an observation; whether it is a transit purchase or a settlement-free peering is an inference, and is labelled as one wherever we show it.
Neighbouring networks
4
adjacent networks
- Upstreams
- 250%
- Peers
- 250%
- Downstreams
- 00%
Networks carrying this one's traffic toward the rest of the internet.
| Network | Country | Relationship | Paths | Vantage pts |
|---|---|---|---|---|
| AS13536FirstLight Networks, LLC | US | Peer | 183 | 116 |
| AS7015Comcast Cable Communications, LLC | US | Peer | 94 | 71 |
Prefixes
The largest blocks AS19704 originates, widest first.
| Prefix | Addresses | Visibility |
|---|---|---|
| 74.85.159.0/24 | 256 | 76/76 |
| 216.57.113.0/24 | 256 | 76/76 |
| 2620:135:2000::/40 | 16.8M × /64 | 63/63 |
| 2001:559:80bb::/48 | 65.5k × /64 | 62/63 |
Routing health
How AS19704's own announcements validate against RPKI and how far they propagate. The same measures for the whole routing table are on the routing table in numbers.
RPKI origin validation
- Valid100.0%4
- Invalid0.0%0
- No ROA0.0%0
Propagation
- Globally propagated90% of full-feed peers or more100.0%4
- Partially propagated40% to 90%0.0%0
- Seen by few peersUnder 40%0.0%0
Prefix sizes
IPv4 — 2 prefixes
IPv6 — 2 prefixes
- /4016.8M × /6450.0%1
- /4865.5k × /6450.0%1
Recent changes
Announcements that started or stopped since 12th Oct 2026.
No announcement by AS19704 started or stopped in this period.
Routing data derived from RouteViews MRT archives, BGPKIT relationship inference and public registry data.